Method of manufacturing a heat transport device, heat transport device, electronic apparatus, and caulking pin

Abstract

A method of manufacturing a heat transport device includes injecting a working fluid that transports heat by a phase change into a casing through an injection opening of the casing under reduced pressure, sealing an injection path by caulking under the reduced pressure, the injection path being provided in the casing into which the working fluid is injected and causing the injection opening and an action area in which the phase change of the working fluid occurs to communicate with each other, contacting a peripheral area of the injection opening of the casing with an inner surface of the injection path by caulking the peripheral area, the peripheral area including the injection opening, and sealing the injection opening by welding a part of the casing contacted.

1 . A method of manufacturing a heat transport device, comprising:
 injecting a working fluid that transports heat by a phase change into a casing through an injection opening of the casing under reduced pressure;   sealing an injection path by caulking under the reduced pressure, the injection path being provided in the casing into which the working fluid is injected and causing the injection opening and an action area in which the phase change of the working fluid occurs to communicate with each other;   contacting a peripheral area of the injection opening of the casing with an inner surface of the injection path by caulking the peripheral area, the peripheral area including the injection opening; and   sealing the injection opening by welding a part of the casing contacted.   
     
     
         2 . The method of manufacturing a heat transport device according to  claim 1 ,
 wherein the caulking in the sealing of the injection path is linear crushing of the casing.   
     
     
         3 . The method of manufacturing a heat transport device according to  claim 2 ,
 wherein the caulking in the sealing of the injection path is crushing of an area that surrounds the injection opening of the casing.   
     
     
         4 . The method of manufacturing a heat transport device according to  claim 2 ,
 wherein the caulking in the sealing of the injection path is performed on an area on the injection path outside an area that surrounds the injection opening.   
     
     
         5 . The method of manufacturing a heat transport device according to  claim 2 ,
 wherein the contacting is performed under an atmospheric pressure after the sealing of the injection path.   
     
     
         6 . The method of manufacturing a heat transport device according to  claim 3 ,
 wherein the contacting is performed simultaneously with the sealing of the injection path.   
     
     
         7 . The method of manufacturing a heat transport device according to  claim 2 ,
 wherein the sealing of the injection path is crushing of the casing with a blade.   
     
     
         8 . The method of manufacturing a heat transport device according to  claim 7 ,
 wherein the blade is annularly formed in a direction in which the casing is crushed.   
     
     
         9 . The method of manufacturing a heat transport device according to  claim 3 ,
 wherein the sealing of the injection path is crushing of the area that surrounds the injection opening of the casing by using a caulking pin with the injection opening being surrounded with an annular blade of the caulking pin, the caulking pin having the annular blade and a concave portion, the annular blade being formed in a direction in which the casing is crushed, the concave portion being formed from the blade and having an inner surface formed vertically from an opening surface of the concave portion that is surrounded by the blade.   
     
     
         10 . The method of manufacturing a heat transport device according to  claim 3 ,
 wherein the sealing of the injection path is crushing of the area that surrounds the injection opening of the casing by using a caulking pin with the injection opening being surrounded with an annular blade of the caulking pin, the caulking pin having the annular blade and a concave portion, the annular blade being formed in a direction in which the casing is crushed, the concave portion having one of a conical shape and a pyramidal shape tapered with increasing distance from an opening surface of the concave portion that is surrounded by the blade.   
     
     
         11 . The method of manufacturing a heat transport device according to  claim 9 ,
 wherein the caulking pin has a convex portion formed in the concave portion toward the opening surface of the concave portion that is surrounded by the blade.   
     
     
         12 . A heat transport device, comprising:
 a working fluid to transport heat by a phase change; and   a casing including an injection opening for the working fluid, an action area in which the phase change of the working fluid occurs, and an injection path that causes the injection opening and the action area to communicate with each other and is sealed by caulking, a peripheral area of the injection opening of the casing being formed to be crushed, the peripheral area including the injection opening, the injection opening being sealed by welding the peripheral area of the injection opening with an inner surface of the injection path.   
     
     
         13 . An electronic apparatus equipped with a heat transport device including a working fluid to transport heat by a phase change and a casing having an injection opening for the working fluid, an action area in which the phase change of the working fluid occurs, and an injection path that causes the injection opening and the action area to communicate with each other and is sealed by caulking, a peripheral area of the injection opening of the casing being formed to be crushed, the peripheral area including the injection opening, the injection opening being sealed by welding the peripheral area of the injection opening with an inner surface of the injection path. 
     
     
         14 . A caulking pin of a heat transport device including a casing, the caulking pin crushing the casing, the casing having an injection opening for a working fluid, an action area in which a phase change of the working fluid occurs, and an injection path that causes the injection opening and the action area to communicate with each other, the caulking pin comprising:
 an annular blade formed in a direction in which the casing is crushed; and   a concave portion formed from the blade and having an inner surface formed from an opening surface of the concave portion that is surrounded by the blade.   
     
     
         15 . A heat transport device including a working fluid between a first member and a second member, the heat transport device comprising:
 a contact portion on which the first member and the second member are contacted annularly; and   a welding portion on which the first member and the second member are welded inside the contact portion.