Casing Structure for Refrigeration System and Method for Producing Casing Therefor

Abstract

A component mounting plate (s 1 ) of a casing for a refrigeration system includes an inner sub-plate ( 2 ), an outer sub-plate ( 3 ) and a heat insulating layer ( 4 ) filled with a heat insulating material, such as urethane. The inner sub-plate ( 2 ) is formed with a mounting hole ( 31 ) through which a mounting bolt ( 30 ) for mounting a component ( 16 ) to the inner sub-plate ( 2 ) passes. The heat insulating layer ( 4 ) contains a nut ( 40 ) disposed to correspond to the mounting hole ( 31 ) and an L-piece ( 41 ) disposed to correspond to the mounting hole ( 31 ) and including an extension ( 43 ) and a seat ( 42 ) with the nut ( 40 ) welded thereto. The L-piece is disposed in the heat insulating layer ( 4 ) with the seat ( 42 ) in contact with the inner sub-plate ( 2 ) and the extension ( 43 ) extending towards the outer sub-plate ( 3 ).

1 . A casing structure for a refrigeration system including an outer sub-plate ( 3 ), an inner sub-plate ( 2 ) and a heat insulating layer ( 4 ) formed between the outer sub-plate ( 3 ) and the inner sub-plate ( 2 ) and made of a heat insulating material, the inner sub-plate ( 2 ) being formed with a mounting hole ( 31 ) through which a mounting bolt ( 30 ) for a component ( 16 ) passes, the casing structure further including:
 a nut ( 40 ) disposed in the heat insulating layer ( 4 ) to correspond to the mounting hole ( 31 ) in the inner sub-plate ( 2 ) and threadedly engaged on the mounting bolt ( 30 ); and   a turning stop piece ( 41 ) having the nut ( 40 ) secured thereto, including a seat ( 42 ) in contact with the inner sub-plate ( 2 ) and an extension ( 43 ) extending from the seat ( 42 ) towards the outer sub-plate ( 3 ) and disposed in the heat insulating layer ( 4 ) to correspond to the mounting hole ( 31 ) in the inner sub-plate ( 2 ).   
   
   
       2 . The casing structure for the refrigeration system of  claim 1 , wherein the seat ( 42 ) of the turning stop piece ( 41 ) is formed into a flat plate extending orthogonally to the mounting bolt ( 30 ). 
   
   
       3 . The casing structure for the refrigeration system of  claim 2 , wherein the extension ( 43 ) of the turning stop piece ( 41 ) is formed by being bent from one side of the seat ( 42 ) in the axial direction of the mounting bolt ( 30 ). 
   
   
       4 . The casing structure for the refrigeration system of  claim 3 , wherein the turning stop piece ( 41 ) is an L-piece ( 41 ) formed in an L-shaped cross section. 
   
   
       5 . The casing structure for the refrigeration system of  claim 1 , wherein
 the seat ( 42 ) of the turning stop piece ( 41 ) is formed with a through hole ( 42   a ) through which the mounting bolt ( 30 ) passes, and   the nut ( 40 ) is welded to the turning stop piece ( 41 ) so that the threaded hole ( 40   a ) of the nut ( 40 ) corresponds to the through hole ( 42   a ).   
   
   
       6 . The casing structure for the refrigeration system of  claim 1 , wherein the seat ( 42 ) of the turning stop piece ( 41 ) is formed with a fitting hole ( 42   b ) for fixing the nut ( 40 ) to the seat ( 42 ) by fitting the nut ( 40 ) into the fitting hole ( 42   b ). 
   
   
       7 . The casing structure for the refrigeration system of  claim 1 , wherein the extension ( 43 ) of the turning stop piece ( 41 ) is formed with a charging hole ( 43   a ) for the heat insulating material. 
   
   
       8 . A method for producing a casing for a refrigeration system, the casing including an outer sub-plate ( 3 ), an inner sub-plate ( 2 ) and a heat insulating layer ( 4 ) formed between the outer sub-plate ( 3 ) and the inner sub-plate ( 2 ), the inner sub-plate ( 2 ) being formed with a mounting hole ( 31 ) through which a mounting bolt ( 30 ) for a component ( 16 ) passes, the method comprising:
 a temporarily retaining step of putting, between the outer sub-plate ( 3 ) and the inner sub-plate ( 2 ), a nut ( 40 ) threadedly engageable on the mounting bolt ( 30 ) and a turning stop piece ( 41 ) including a seat ( 42 ) with the nut ( 40 ) secured thereto and an extension ( 43 ) extending from the seat ( 42 ) in the axial direction of the mounting bolt ( 30 ), while bringing the seat ( 42 ) of the turning stop piece ( 41 ) into contact with the inner sub-plate ( 2 ), and threadedly engaging a temporal bolt ( 45 ) through the mounting hole in the inner sub-plate ( 2 ) into the nut to retain the temporal bolt ( 45 ) to the inner sub-plate ( 2 );   a heat insulating step of charging a heat insulating material between the outer sub-plate ( 3 ) and the inner sub-plate ( 2 ) to form a heat insulating layer ( 4 ); and   a component mounting step of removing the temporal bolt ( 45 ) and mounting a component ( 16 ) to the inner sub-plate ( 2 ) by threadedly engaging the mounting bolt ( 30 ) in the nut ( 40 ).