Abstract:
A direct resistance heating apparatus (10;20;40;50) includes a first electrode (11;21;41;51) and a second electrode (12;22;42;52), and a moving mechanism (15;25;45;55) configured to move at least one of the first electrode (11;21;41;51) and the second electrode (12;22;42;52). A direct resistance heating method includes steps of providing a workpiece (w) having a heating target region, a resistance of which per unit length in one direction thereof varying along the one direction, placing a first electrode (11;21;41;51) and a second electrode (12;22;42;52) on the heating target region, and moving at least one of the first electrode (11;21;41;51) and the second electrode (12;22;42,52) such that a time during which the electric current is applied to each part of the heating target region is adjusted in accordance with a change of the resistance per unit length, thereby heating the workpiece (w) such that the each part of the heating target region is heated to a temperature within a target temperature range.
Abstract:
The present invention provides a method and apparatus of reducing current requirements by increasing resistance of the blade structure by reducing the cross sectional area of at least one section (12) of the blade (10) so that the electrical current requirements for heating of the blade to cutting temperature are reduced wherein the power supply and substantially entire unit may be mounted within a hand held unit. Methods of shaping blades to perform various heat distributions for specialty blades for custom cutting are disclosed. Further, an improved blade mounting structure (120, 240) is provided which includes structure for maintaining the legs of the blade parallel to the direction of cut and provides for easy insertion of new blades by maintaining a slotted blade cradle (180, 182, 260, 262) stable and in alignment with the blades (140, 250) and a clamp member (210, 220, 310, 320) away from the blade (140, 250) when the clamp mounting structure is loosened.
Abstract:
El aparato descongelador de la presente invención emplea como principio de operación el calentamiento óhmico poniendo a circular una corriente eléctrica a través de bloques de alimento. En el caso particular de los alimentos, su capacidad para conducir la corriente eléctrica es baja, lo cual hace que se disipe energía en el material en forma de calor, provocando su calentamiento. En este caso, el bloque del alimento congelado actúa como una resistencia en el circuito eléctrico que se opone al paso de la corriente. El aparato descongelador de la presente invención está compuesto de manera general por una pluralidad de compartimientos para ubicar los bloques del alimento congelado y por medio de electrodos conectarlo a un circuito eléctrico; cuenta con una pluralidad de módulos de calentamiento, un módulo de control y monitoreo de las variables, una pluralidad de módulos de potencia que suministra la energía eléctrica necesaria y una pluralidad de módulos neumático que garantiza el contacto de los bloques del alimento con los electrodos del sistema de potencia. Los módulos de calentamiento están diseñados para recibir los bloques congelados del alimento y suministrar la energía eléctrica necesaria para calentar el material y lograr la temperatura deseada. El aparato descongelador está compuesto por una pluralidad de módulos de calentamiento, dependiendo de la capacidad que se requiera y de la geometría de los bloques del alimento a ser descongelados, el número puede estar entre cuatro y ocho módulos, sin ser limitante. El módulo de control y monitoreo de variables diseñado para registrar el comportamiento de las variables que hacen parte del proceso de descongelación y funcionamiento del equipo. El equipo cuenta con un único sistema que gobierna toda su operación. El proceso de descongelamiento para bloques de alimentos congelados esta caracterizado por (i) ubicar el bloque de alimentos congelado en una pluralidad de compartimientos, (ii) conectarlo a un circuito eléctrico por medio de electrodos, (iii) garantizar el contacto del bloque congelado de alimento con los electrodos y (iv) circular una corriente eléctrica a través de dicho bloque de alimento congelado. En donde dicha corriente eléctrica, as la necesaria para calentar el bloque congelado de alimento y lograr la temperatura necesaria.
Abstract:
To improve an electrode boiler (10) for generating heat, having a housing (11) arranged in a heating circuit, having at least one feed (13a, b) and a discharge (14a, b) for a fluid heat exchange medium and an ionization chamber (16) arranged in the housing (11), comprising a wall (26) formed as an electrode and an ionizing rod (19) arranged within the wall (26) for ionizing the heat exchange medium as it flows through the housing (11), the housing (11) being formed completely or to a large extent from non-conductive material, in particular from a thermoplastic or thermosetting plastic, preferably PTFE, the invention proposes that a passage duct for liquid, in particular for drinking water, be provided between the surface (29) of the wall (26) that faces the housing (11) and the housing inner wall (28).
Abstract:
A method and system of heating a body of molten aluminum, for example, contained in a heating bay, the method comprising providing a body of molten aluminum (200); projecting an electric powered heater (10) into the body of molten aluminum (200) passing electric current through the element (14) and adding heat to the body of molten aluminum (200). The heater (10) is comprised of a sleeve (12) suitable for immersing in the molten aluminum. The sleeve (12) may have a closed end (32) and is comprised of a composed material comprised of an inner layer (30) of titanium or titanium alloy having an outside surface having a refractory coating (34) thereon exposed to the molten aluminum, the refractory coating (34) resistant to attack by the molten aluminum. An electric heating element (14) is located in the sleeve (12) in heat transfer relationship therewith for adding heat to the molten aluminum.