Abstract: This vacuum cleaning device is provided with: a vapor chamber in which vapor of a hydrocarbon-based cleaning agent is generated; a condensation chamber; a first heat exchanger in which heat exchange between the vapor and a heating medium is carried out; a cleaning chamber in which a workpiece can be cleaned under vacuum by the condensed cleaning agent that has been generated in the condensation chamber; a compressor that adiabatically compresses and further heats the heating medium that was heated by the first heat exchanger; a second heat exchanger that carries out heat exchange between the heating medium heated by the compressor and the hydrocarbon-based cleaning agent in the vapor chamber; and a vacuum unit that further cools the heating medium that has been cooled by the second heat exchanger by forcing vacuum expansion of the heating medium.

Abstract: Graphite is produced from powder as a carbon source by means of a graphitization furnace. The graphitization furnace is comprised of: an electrically conductive crucible including a hollow configured to house the powder; an electrode including a columnar shaft and a head provided at an end of the shaft, the head having a shape selected from the group consisting of a sphere, a hemisphere, a column with a rounded edge, a cone, and a cone with a rounded tip; and a power source configured to apply electric current to the powder through the crucible and the electrode.

Abstract: A graphitization furnace includes: a first electrode; a second electrode disposed so as to face the first electrode; a first energized heating element provided on a surface of the first electrode facing the second electrode; and a second energized heating element provided on a surface of the second electrode facing the first electrode. The first and second energized heating elements are configured to allow to be disposed therebetween, an object to be processed. The graphitization furnace is configured to heat and graphitize the object to be processed disposed between the first and second energized heating elements by energizing between the first and second electrodes.

Abstract: A furnace for continuously graphitizing carbon fibers includes a supply unit configured to supply an object to be treated made of carbon fibers, a chamber in which the supplied object to be treated is graphitized, and a recovery unit configured to recover the graphitized object to be treated, in which the chamber includes a preheating zone in which the supplied object to be treated is preheated, and an electric heating zone in which the preheated object to be treated is electrically heated, and the electric heating zone includes a pair of electric rolls across which the preheated object to be treated is strung, and a DC power source that is connected to the pair of electric rolls and applies a current between the pair of electric rolls through the preheated object to be treated that is strung across the pair of electric rolls.

Abstract: A graphitization furnace (100) includes: split electrodes (122) that are conductive and are provided so as to be freely movable; crucibles (120) that are conductive and that contain carbon powder, with a bottom end portion (122a) of each split electrode (122) being buried in the carbon powder; upper electrodes (190) that are positioned so as to face a split electrode (122); lower electrodes (192) that are positioned so as to face a crucible (120); and a power supply unit (132) that, when a bottom end portion (190a) of an upper electrode (190) is placed in contact with a top end portion (122b) of a split electrode (122) and a top end portion (192a) of a lower electrode (192) is placed in contact with a base portion (120b) of a crucible (120), applies a voltage between the upper electrode (190) and the lower electrode (192).

Abstract: This vacuum cleaning device is provided with: a vapor chamber in which vapor of a hydrocarbon-based cleaning agent is generated; a condensation chamber; a first heat exchanger in which heat exchange between the vapor and a heating medium is carried out; a cleaning chamber in which a workpiece can be cleaned under vacuum by the condensed cleaning agent that has been generated in the condensation chamber; a compressor that adiabatically compresses and further heats the heating medium that was heated by the first heat exchanger; a second heat exchanger that carries out heat exchange between the heating medium heated by the compressor and the hydrocarbon-based cleaning agent in the vapor chamber; and a vacuum unit that further cools the heating medium that has been cooled by the second heat exchanger by forcing vacuum expansion of the heating medium.

Abstract: The continuous firing furnace includes: a single or a plurality of heating units (120), each of which includes a casing (120b) provided with a through-hole (120a) in a transport direction of a material to be heated, a heating section (160) that heats the material to be heated, and a movable section (150) that is provided at a lower portion of the casing and that supports and allows the casing to move in a horizontal direction, wherein through-holes are formed so as to be able to communicate with each other in the transport direction; a single or a plurality of cooling units (122) configured to cool the material to be heated, each of which includes a casing (122b) provided with a through-hole (122a) in the transport direction of the material to be heated, and a cooling section (170) that cools the material to be heated, wherein through-holes are formed so as to be able to communicate with the through-holes of the plurality of heating units; and a pressing section (124) configured to press the single or the plu

Abstract: A graphitization furnace (100) includes: split electrodes (122) that are conductive and are provided so as to be freely movable; crucibles (120) that are conductive and that contain carbon powder, with a bottom end portion (122a) of each split electrode (122) being buried in the carbon powder; upper electrodes (190) that are positioned so as to face a split electrode (122); lower electrodes (192) that are positioned so as to face a crucible (120); and a power supply unit (132) that, when a bottom end portion (190a) of an upper electrode (190) is placed in contact with a top end portion (122b) of a split electrode (122) and a top end portion (192a) of a lower electrode (192) is placed in contact with a base portion (120b) of a crucible (120), applies a voltage between the upper electrode (190) and the lower electrode (192).

Abstract: Graphite is produced from powder as a carbon source by means of a graphitization furnace. The graphitization furnace is comprised of: an electrically conductive crucible including a hollow configured to house the powder; an electrode including a columnar shaft and a head provided at an end of the shaft, the head having a shape selected from the group consisting of a sphere, a hemisphere, a column with a rounded edge, a cone, and a cone with a rounded tip; and a power source configured to apply electric current to the powder through the crucible and the electrode.