2 results about "Joule" patented technology

A heat generating roller, fixing equipment and an image forming apparatus in which warm-up time is shortened while preventing excessive temperature rise and good fixing performance is realized by preventing occurrence of offset. In the heat generating roller, fixing equipment and image forming apparatus, the heat generating roller is formed principally by laying a high permeability conductive layer and a nonmagnetic conductive layer in layer. When a voltage is applied from a power supply (not shown) to an exciting coil and an AC current flow through it, magnetic flux is generated around the exciting coil and a magnetic field is formed. Since the heat generating roller has the high permeability conductive layer and the nonmagnetic conductive layer laid in layer, magnetic coupling of a system consisting of the heat generating roller and the exciting coil is good at the time of low temperature and heat generation of the heat generating roller is accelerated. When the Curie point is exceeded, skin depth becomes deep and skin resistance decreases, which suppresses generation of Joule's heat and reduces heat generation of the heat generating roller.

The invention discloses a magnetic collector for magnetic pulse forming, and relates to a magnetic collector. The invention aims at solving the problem that the structural strength of a magnetic collector, the insulation capacity of the gap of a longitudinal joint of the magnetic collector, and the insulation capacity between a working area of the magnetic collector and the machined workpiece are reduced due to a rapid temperature rise generated during a continuous magnetic pulse forming process, so that short circuit and structural damages among the longitudinal joint of the magnetic collector, the magnetic collector and the workpiece are caused, and finally the formation production chain is broken. According to the invention, at least one cooling channel ring is machined on a longitudinal arm; each cooling channel ring comprises a plurality of cooling channels; each cooling channel penetrates through an inner sleeve body in the longitudinal length direction and is internally charged with a refrigeration gas or a refrigeration liquid; and every two cooling channels are communicated through an external tube so as to form a serial cooling pipeline or a parallel cooling pipeline; and the Joule heat generated by the magnetic collector during multiple charge-discharge processes is brought away by charging the refrigeration gas or the refrigeration liquid in the cooling channel rings, thus effectively assisting to cool the magnetic collector. The magnetic collector disclosed by the invention is used in a magnetic pulse forming process.