Vacuum insulation panel manufacturing method, and vacuum insulation panel

Abstract

A vacuum insulation panel manufacturing method that makes it possible to manufacture low-cost, high-performance vacuum insulation panels, and a vacuum insulation panel are provided. This method of manufacturing a vacuum insulation panel involves: a stacking step in which a first metal plate is stacked on one side of an insulating core material, and in which a backing member having an opening and a second metal plate having an evacuation port are stacked, with the opening and the evacuation port stacking, on the other surface of the core member in the order of backing member and second metal plate from the core member side; a first welding step for welding outwards of where the core member is arranged in the first metal plate and the second metal plate; an evacuating step from the evacuation port to create a vacuum in an inner area which is held between the first metal plate and the second metal plate and in which the core member is arranged; and a laser welding step in which, in a state in which the inner area is made into a vacuum by the evacuating step, the evacuation port is sealed by means of a sealing material and the sealing material, the second metal plate and the backing member are laser welded.

1 . A vacuum insulation panel manufacturing method comprising:
 a stacking step in which a first metal plate is stacked on one side of an insulating core member, and in which a backing member having an opening and a second metal plate having an evacuation port are stacked, with the opening and the evacuation port stacking, on the other surface of the core member in the order of the backing member and the second metal plate from the core member side;   a first welding step for welding outwards of where the core member is arranged in the first metal plate and the second metal plate;   an evacuating step for applying a vacuum in an inner area which is held between the first metal plate and the second metal plate and in which the core member is arranged, from the evacuation port; and   a laser welding step in which, in a state in which the inner area is made into a vacuum by the evacuating step, the evacuation port is sealed by means of a sealing member and the sealing member, the second metal plate and the backing member are laser welded.   
     
     
         2 . The vacuum insulation panel manufacturing method according to  claim 1 , wherein the laser welding step is
 for lowering the sealing member and blocking the evacuation port by way of the sealing member, an outer periphery of the sealing member being held by a holding plate including a hole for allowing laser light to pass through,   the sealing member is pressed toward the evacuation port side,   whereby sandwiching the second metal plate between the backing member and the sealing member, and in a state in which a stacked portion between the sealing member, the second metal plate and the backing member is restrained without any gap,   the sealing member, the second metal plate and the backing member are laser-welded.   
     
     
         3 . The vacuum insulation panel manufacturing method according to  claim 1 , wherein
 the evacuating step is for starting evacuating from the evacuation port to apply a vacuum in an inner area which is held between the first metal plate and the second metal plate   and in which the core member is arranged by covering with the chamber a partial region including the evacuation port of the second metal plate,   in a state in which the sealing member is temporarily lowered and allowed to approach the evacuation port.   
     
     
         4 . The vacuum insulation panel manufacturing method according to  claim 3 , wherein laser irradiation is performed from an outer side of the chamber in the laser welding step. 
     
     
         5 . The vacuum insulation panel manufacturing method according to  claim 1 , wherein
 the sealing member is made of a magnetic body, and   the holding plate for holding the sealing member includes a magnet and holds the sealing member by using a magnetic force.   
     
     
         6 . The vacuum insulation panel manufacturing method according to  claim 1 ,
 wherein the holding plate for holding the holding unit is supported by way of a support rod attached in three places along an outer periphery, and   wherein an upper end of the support rod is fixed to a lifting plate, passing through an outer periphery of a portion where a window is provided to an upper middle portion of the chamber, in which quartz glass is attached to the window.   
     
     
         7 . The vacuum insulation panel manufacturing method according to  claim 1 , wherein the first welding step is a seam welding step.