The present disclosure teaches a microwave and wire mesh oven that enables a heating of a wire mesh element and the use of a microwave generator (magnetron) for use in high speed heating applications. In particular, the system includes a wire mesh element to radiate blackbody radiation to heat primarily an exterior of an item, and a magnetron to radiate microwaves to heat primarily an interior of an item. The blackbody transferring heat either by conduction in solids, convection of fluids (liquids or gases) or radiation through anything that will allow radiation to pass
In the prior art, disposing a wire mesh heating element to radiate blackbody radiation on item disposed in a microwave oven cavity is difficult due to leakage of microwaves, current leakage, effect of microwaves on the wire mesh, a spark hazard when microwaves impinge on the wire mesh and the like.
The present teachings provide embodiments of heating system and methods, and features thereof, which offer various benefits. The system can employ multiple electrodes, systems, operations, and the like to promote safe, efficient, and effective use of the devices and methods disclosed herein.
The present teachings disclose a microwave wire mesh oven including: a microwave oven cavity; a wire mesh element positioned to radiate black body radiation into the microwave oven cavity; and a magnetron configured to generate microwaves, wherein some of the generated microwaves impinge on the wire mesh element.
The present teachings disclose a microwave wire mesh oven including: a microwave oven cavity defined by sidewall; a wire mesh element positioned to radiate black body radiation into the microwave oven cavity; a magnetron configured to generate microwaves that impinge on the wire mesh element; and a conductor traversing through the sidewall via an opening wherein the way the opening is shielded against electromagnetic energy.
The present teachings disclose a microwave wire mesh heater including: a magnetron; a wire mesh element having a surface area including a non-contact area and a contact area along at least 50% of a wire mesh element length; a conductor in electrical contact with the wire mesh; an elastic thermal insulator bonded to at least one edge of the wire mesh element; and a fastener to secure the elastic thermal insulator, wherein the contact area contacts the conductor and the elastic thermal insulator is stretched and secured tautly under tension to the fastener prior to operation of the wire mesh heater, and the elastic thermal insulator keeps the wire mesh element tautly under tension during operation of the wire mesh heater.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention.
Throughout the drawings and the detailed description, unless otherwise described, the same drawing reference numerals will be understood to refer to the same elements, features, and structures. The relative size and depiction of these elements may be exaggerated for clarity, illustration, and convenience.
The present teachings disclose efficiently transferring electrical energy to a wire mesh heating element. In exemplary embodiments, the transfer is evenly distributed over a breadth or length of the wire mesh. This may reduce the stress induced in the wire mesh, and reduce the heat being generated during the electrical energy transfer. The present teachings may evenly distribute any heat being generated during the electrical energy transfer. By reducing the heating and/or more evenly distributing the heat, the mean time between failures of the wire mesh heater may be increased.
The present teachings disclose a heating element system that operates semi-continuously or continuously at high temperatures. The present teachings also disclose constant tensioning of a wire mesh heating element during use so that the element as a whole remains flat. The present teachings also disclose a wire mesh heating element that can operate in a heating cavity in a semi-continuous or continuous mode and that can be replaced easily.
In exemplary embodiments, a wire mesh heating assembly may include a primary conductor directly attached to the wire mesh heating element, and a secondary conductor or holder to secure the primary conductor through which the electrical current can flow. In some embodiments, the primary conductor may include a primary conduction rod or electrode.
According to various embodiments, the primary conductor may be continuous or fully or partially segmented. The primary conductor may contact a length of the wire mesh element.
The secondary conductor may tension, stretch or keep taut the wire mesh heating element in operation. In some embodiments, the secondary conductor may provide an adjustable tension for the wire mesh heating element in operation. The secondary conductor may include multiple tension points, a heat shield protection, and a latch or the like to provide ease of gripping and release of the primary conductor.
In exemplary embodiments, a flexible or movable electrical connection may connect an electrical energy source to the primary conductor. The flexible or movable electrical connection may include a stranded wire or telescoping nested tubes attached to the secondary conductor.
In exemplary embodiments, the wire mesh heating element may include a wire mesh cloth. In exemplary embodiments, the wire mesh heating element may include a wire intersecting wire strands with openings defined by the wire stands. In exemplary embodiments, the wire mesh heating element may include a perforated metal sheet.
In exemplary embodiments, the wire mesh heating element may be formed to include only curved orifice openings for at least an area of the wire mesh that will be exposed to microwave radiation. In exemplary embodiments, the wire mesh may include round or oval openings. For example, the wire mesh heating element may be formed by perforating a metal sheet with round or oval holes. In an exemplary embodiment, the wire mesh may include holes/openings that are 0.020 inches in diameter and each of opening/hole centers are offset by 0.043 inches from one another. Such a wire mesh can provide, for example, a 20% open area through the wire mesh.
A wire mesh and microwave heater 100 may include a wire mesh element 102, a magnetron 104, an AC-DC converter or high wattage power supply 106 to energize the wire mesh element 102, an microwave oven cavity 108 to house an item to be heated, a sidewall 110 to define an oven cavity 108, an operator console 116 and a power line 114 to receive electrical energy from an energy producer, such as a utility.
The wire mesh element 102 can be disposed in the oven cavity 108 where radiation from the magnetron 104 impinges on the wire mesh element 102. In some embodiments, only one wire mesh element 102 may be disposed in the oven cavity 108. Both the magnetron 104 and the wire mesh element 102 may be operated selectively or simultaneously. A user of the wire mesh and microwave heater 100 may utilize the operator console 116 to operate the wire mesh and microwave heater 100 as desired. Conductors (see
In exemplary embodiments, the sidewalls 110 of the oven cavity 108 may act as a Faraday cage or shield. A Faraday cage or Faraday shield is an enclosure formed by conductive material or by a mesh of such material. Such an enclosure blocks external static and non-static electric fields by channeling electricity along and around, but not through, the mesh, providing constant voltage on all sides of the enclosure. Since the difference in voltage is the measure of electrical potential, no current flows through the space. In exemplary embodiments, the sidewalls 110 of the oven cavity 102 may act as a reflector shield for the radiation generated by the wire mesh element 102.
In some embodiments, the high wattage power supply 106 may include a stored energy device 112. Power in excess of the capacity of the AC power line may be provided by the stored energy device 112. A microwave controller (not shown) may operate the wire mesh and microwave heater 100 as desired by energizing the magnetron 104, the wire mesh element 102 or both as desired by a user. To effectuate the operation as desired by user, the microwave controller may pulse delivery of electrical energy to the wire mesh element 102. The pulse delivery of electrical energy to the wire mesh element 102 may include changing a duration of energy delivery, changing an amplitude of energy delivery, or a combination thereof. In some embodiments, the microwave controller may control the intensity of the electrical energy delivered to the wire mesh element 102.
A sidewall 216 of a microwave oven cavity 218 may allow a passage for or be pierced by conductors 208, 210. The conductors 208, 210 may energize the wire mesh element 212 from a voltage source 214. At the point of the passage or piercing of the sidewall 216, conductors 208, 210 may be surrounded by a screening gland or connector 204, for example, a 360° gland or connector. In some embodiments, conductors 208, 210 may be filtered, for example, by a DC power supply filter, so that any microwaves conducted by the conductors 208, 210 through the sidewall 216 may be eliminated in order to control microwave leakage or leakage currents from the oven cavity 218. The wire mesh element 212 may be secured to the conductors 208, 210 via a weld or the like. The conductors 208, 210 may be rotatable in a direction indicated by arrow 222. A portion of the conductors 208, 210 may be rotatable only within the oven cavity 218. The rotation of the conductors 208, 210 may keep the wire mesh 212 under tension.
In exemplary embodiments, a Faraday cage 202 may be provided. The Faraday cage 202 may be disposed such that the screening gland or connector 204 is disposed in a void defined by the sidewall 216 and the Faraday cage 202.
A microwave and wire mesh oven 300 may include a microwave oven cavity 302 defined by a sidewall 308. A wire mesh heating element 312 may be disposed in the microwave oven cavity 302. The wire mesh heating element 312 may be disposed in electrical contact with conductors 304, 306. A fastener 310 may be disposed in a sidewall 308 of the oven cavity 302. The fastener 310 may be a tensioning device that can keep the wire mesh 312 taut. In some embodiments, the wire mesh 312 may have a tensioning material 314, for example, silicon, disposed along one or more edges of the wire mesh 312. The fastener 310 can be secured in the tensioning material 314 in order to keep the wire mesh 312 taut. The wire mesh 312 may include a bend, splined, rod or the like (not shown) to prevent the wire mesh 312 from sagging.
A wire mesh assembly 400 may include the wire mesh 402 and an elastic 404. The wire mesh assembly 400 may include a secondary conductor 410 (see
The elastic 404 may be a springy material able to withstand high temperatures, for example, silicone. The wire mesh 402 may be secured or fastened to the secondary conductor 410. The secondary conductor 410 may be movably disposed over one or more of the two conductors 406, 408 in order to provide a high-performing electrical contact between the wire mesh 402 and one or more of the two conductors 406, 408. In some embodiments, a solder, swage, weld or the like may be used to secure the wire mesh 402 to the secondary conductor 410. The wire mesh assembly 400 can be disposed under tension (tautly) over the two conductors 406, 408. In some embodiments, the two conductors 406, 408 may be immovably secured in a holder 442. In some embodiments, one of the two conductors 406, 408 may be movably secured in the holder 442, while the other of the two conductors 406, 408 may be immovably secured in the holder 442. A heat shield 444 may be disposed between the heat zone 426 and the elastic material 404. In exemplary embodiments, the heat shield 444 may be glass. In exemplary embodiments, the heat shield may be secured in the two conductors 406, 408 in a slot 412.
A microwave mesh heater 500 may include the wire mesh sub-assembly 514 including one or more primary conductors 502 and a heat shield 506. The wire mesh sub-assembly 514 may be secured to a wall or sidewall 516 of microwave mesh heater 500. A flange or connector 504 can be disposed around the one or more primary conductors 502. The flange or connector 504 can be used to prevent a leakage of microwave waves from an oven cavity 512. The oven cavity 512 may be defined at least in part by the sidewall 516. A thin film insulator (not shown) can be disposed between the flange or connector 504 and the sidewall 516. In some embodiments, a sidewall of microwave mesh heater 500 may include a turntable 530 for a tray to rotate thereupon. A heat shield 524 may be disposed between the one more conductors 502. In some embodiments, openings behind washers 510 may be used to secure a second wire mesh sub-assembly.
As shown in
The elastic 520 may be a springy material able to withstand high temperatures, for example, silicone. The wire mesh 522 may be secured or fastened to the secondary conductor 518. The secondary conductor 518 may be movably disposed over one or more of the two conductors 502 in order to provide a high-performing electrical contact between the wire mesh 522 and one or more of the two conductors 502. In some embodiments, a solder, swage, weld or the like may be used to secure the wire mesh 522 to the secondary conductor 518. The wire mesh 522 can be disposed under tension (tautly) over the two conductors 502 with the aid of the elastic 520. In some embodiments, the two conductors 502 may be immovably secured to the sidewall 516. In some embodiments, one of the two conductors 502 may be movably secured in the wire mesh sub-assembly 514, while the other of the two conductors 502 may be immovably secured in the wire mesh sub-assembly 514. The heat shield 524 may be disposed between the wire mesh 522 (a heated portion of the wire mesh 522) and the elastic material 520. In exemplary embodiments, the heat shield 524 may be glass, for example, a glass suitable for use in high temperature environments, tempered glass. In exemplary embodiments, edges of the heat shield 524 may be secured by or disposed in the two conductors 502.
A platen or tray 532 may be disposed about the turntable 520. The microwave mesh oven 500 may use a latch 534 to secure a microwave oven door 536. The latch 534 may incorporate a failsafe switch that may prohibit operation of the microwave mesh oven 500 unless the microwave oven door 536 is closed.
In some embodiments, a microwave mesh heater 600 may include a wire mesh heater assembly 602 and a control panel 604. The microwave mesh heater 600 may include a heating cavity 605. As seen in the cutout of
In some embodiments, a wire mesh heater assembly 700 may include a wire mesh element 702, an air duct 712, an inlet 714, an outlet (not shown) and a fan (not shown).
In some embodiments, a microwave mesh heater 800 may include a microwave outlet 802 behind which a magnetron (not shown) is disposed, a rack 804 where an item to be heated may be disposed, a bottom wire mesh heater assembly 806, a top wire mesh heater assembly 808, an oven cavity 810 and a stand 812 disposed to maintain a distance between the bottom wire mesh heater assembly 806 and the stand 812. As seen in the
In some embodiments, a microwave mesh heater 900 may include a bottom surface 904, a microwave outlet 908 behind which a magnetron (not shown) is disposed, a tray 906, a rack 912, a wire mesh heater assembly 902, an oven cavity 910 and a stand 912. As seen in
In some embodiments, a wire mesh heater assembly 1100 may include a wire mesh element 1102, an air duct 1112 (see
The examples presented herein are intended to illustrate potential and specific implementations. It can be appreciated that the examples are intended primarily for purposes of illustration for those skilled in the art. The diagrams depicted herein are provided by way of example. There can be variations to these diagrams or the operations described herein without departing from the spirit of the invention. For instance, in certain cases, method steps or operations can be performed in differing order, or operations can be added, deleted or modified.
The present application is a 371 of International Patent Application No. PCT/US2016/052018 filed Sep. 15, 2016, which claims the benefit of U.S. Provisional Application No. 62/219,112, filed Sep. 15, 2015, and U.S. Provisional Application No. 62/289,898, filed Feb. 1, 2016, all of which are incorporated in their entirety by reference for all purposes as if fully set forth herein.
Filing Document | Filing Date | Country | Kind |
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PCT/US2016/052018 | 9/15/2016 | WO | 00 |
Number | Date | Country | |
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62219112 | Sep 2015 | US | |
62289898 | Feb 2016 | US |