摘要:
A multiple head induction sealing system includes at least two ferrite cores mounted which are channel-shaped and arranged so that the open ends of the channels are aligned either perpendicular or parallel to a workflow direction established as the objects to be heated pass beneath the unit. A litz wire coil is disposed proximate to each ferrite core which produces an electromagnetic field within the ferrite core. The ferrite cores and litz wire coil are adapted to direct the electromagnetic field toward an object to heat it.
摘要:
The invention relates to a coil to be used in transverse flux induction heating of an object in the form of a metal strip or another elongate metal workpiece. The coil contains at least one pair of loops of conductors, which are non-symmetrically positioned to each other and the conductors overlap each other so that the inductor has double conductors across the object to be heated and a single conductor parallel to the object to be heated at the edges. The heating effect is prevented alone in the conductors by dividing the induced current for the conductors to two equal branches each having the same width as the original current and the combined heating effect in the branches is only half of the heating effect before branching.
摘要:
Thermoset heating compositions for use in alternating magnetic fields include fiber based heating agents which have remarkably and unexpectedly high heating efficiencies. The fibers operate efficiently at lower field intensities; at lower frequencies and with smaller diameters (related to skin depths) than prior art technologies. The fibers may be formed from a variety of ferromagnetic materials, including, for example: iron, nickel, cobalt, chromium and alloys thereof. The preferred materials group is: carbon steel, magnetic stainless steel, nickel, ferromagnetic coated electrically conductive materials, ferromagnetic coated electrically nonconductive materials. The fibers are sized, in accordance with skin effect theory, to heat effectively at a frequency substantially higher that the actual frequency to be utilized. The fibers have lower apparent density and/or smaller diameters and/or higher surface areas and/or substantially higher heating efficiency than powder of the same ferromagnetic composition for operation at a given frequency.
摘要:
A thawing device for railway track points is constituted by connecting a heating coil (1a) wound around a floor plate (2) for heating the floor plate (2) by induction to an inverter device (5) for supplying high-frequency current to the heating coil (1a), via a connection cable (4); and providing a protection against magnetism (9, 10a-10c, 11a-11c , 12a, 12b) about the periphery of the heating coil (1a) and the connection cable (4).
摘要:
An induction heatable body (22) that quickly heats to a desired temperature, retains heat long enough to be used in almost any application, and develops no “hot spots” even when heated by a heating source having an uneven magnetic field distribution. The induction-heatable body (22) achieves the foregoing while remaining relatively lightweight, inexpensive and easy to manufacture. The induction-heatable body (22) includes a plurality of induction-heatable layers (32a, b, c) each sandwiched between alternating layers of heat retentive material (34a, b, c). The induction-heatable layers (32a, b, c) consist of sheets of graphite material that can be inductively heated at magnetic field frequencies between 20 and 50 kHz. The heat-retentive layers (34a, b, c) consist of solid-to-solid phase change material such as radiation cross-linked polyethylene. A food delivery assembly (100) uniquely adapted and configured for maintaining the temperature of sandwiches, french fries, and other related food items is also disclosed. The food delivery assembly (100) includes a magnetic induction heater (110), a food container (112), and a delivery bag (114) for carrying and insulating the food container (112).
摘要:
Apparatus for controlled-atmosphere brazing of parts or components having cross-sectional dimensions of up to twenty-four inches. The apparatus maintains the components or parts at a uniform temperature during the brazing cycle. The apparatus includes a susceptor having a physical boundary that separates an interior of the susceptor from its exterior. While there is no limitation upon the length of the parts or components that can be brazed, the wall of the susceptor formed as a physical boundary has an internal diameter that limits the maximum cross-sectional dimension of the parts or components that are to be brazed, so that the parts or components reside within the interior of the susceptor. A heating source for heating the susceptor is provided. The heating source is capable of heating the susceptor sufficiently so that the interior of the susceptor can reach a temperature sufficient to braze the components inside the susceptor. The susceptor containing the parts to be brazed and heating source are placed within a chamber that can provide a desired protective environment, such as a vacuum, an inert gas atmosphere, a reducing gas or nitrogen. The susceptor conducts and radiates the heat across its physical boundary so that a uniform temperature is attained and maintained within the interior of the susceptor during the brazing cycle. The susceptor is desirably comprised of graphite or a refractory metal.
摘要:
A method and apparatus for inducing a physical change in at least one metal workpiece are provided. Energy is applied to at least a portion of the metal workpiece, the energy being a combination of energies of at least two distinct sources. One of these energies is a pulsed magnetic force (PMF) energy which induces a rapid movement in a portion of the metal workpiece. The second energy is one which acts synergistically with the first energy to impart the desired physical change.
摘要:
An energy storage system for use in a magnetic pulse welding and forming apparatus includes a bank of capacitors and a very-low inductance conductive bus system interconnecting the capacitors. The bus system provides the ability to generate a very high frequency, short duration impulse which is needed for welding. The energy storage system further includes an energy source connected to the capacitors, a discharge device, a charging control device, and a discharge control device for selectively initiating discharge of energy stored in the capacitors. Inductor tools used in connection with the energy storage system are split to allow parts to be welded to be easily mounted into and removed from the inductor tools. One part of the split inductor tool is either rotatable or slidably movable relative to a fixed part of the inductor.
摘要:
A device for degassing and brazing preassembled vacuum interrupters in only one brazing operation includes a base plate having at least one brazing site which features an opening of the base plate for connecting a suction pump and a bell which covers the opening and can be put on the base plate and lifted off. The bell is surrounded on the outside by an excitation coil to which medium- or high-frequency energy can be applied. The device includes a medium- or high-frequency generator for the excitation coil and with a cylindrical tubular susceptor arranged inside the bell for receiving at least one preassembled vacuum interrupter.
摘要:
The steam generating system utilizing a first container having a liquid chamber. The first container is surrounded by a conducting coil for generating a field and producing eddy currents on the container. Steam produced in the first container is sent to a second container which is similarly heated by an induced eddy current. Steam in the second container is superheated for use.