Novel arrangement of non-evaporable getters for a tube solar collector

Abstract

The invention relates to a novel arrangement of non-evaporable getters for a tube solar collector, said tube collector being of the type that includes an outer glass tube ( 2 ); an inner metal tube ( 3 ) through which a heat-transfer fluid flows; a vacuum chamber between both tubes; and, at the ends, non-evaporable getter pellets ( 1 ) that absorb gas molecules that could produce a loss of vacuum between the inner tube ( 3 ) and the outer tube ( 2 ) and the covers ( 8 ) at which a bellows-type expansion compensating device ( 4 ) is positioned. The inner metal tube ( 3 ) and outer glass tube ( 2 ) are positioned eccentrically to one another, forming a thicker area and a narrower area in the cover ( 8 ), said narrower area being used for the positioning, by means of bonding, of the non-evaporable getter pellets ( 1 ).

1 . Novel arrangement of non-evaporable getters for a tube solar collector, the tube collector being of the type that includes an outer glass tube; an inner metal tube through which a heat-transfer fluid flows; a vacuum chamber between both tubes; and, at the ends, non-evaporable getter pellets that absorb gas molecules that could produce a loss of vacuum between the inner tube and the outer tube and the covers at which a bellows-type expansion compensating device is positioned, wherein the tube solar collector is symmetrical, having the same non-evaporable getter pellets arrangement at both ends of the tube and the cover being reinforced, the inner metal tube and outer glass tube being positioned eccentrically to one another, forming a thicker area and a narrower area in the cover, said narrower area being used for the positioning, by means of bonding of the non-evaporable getter pellets. 
     
     
         2 . Novel arrangement of non-evaporable getters for a tube solar collector according to  claim 1 , wherein the cover is reinforced with a series of radial nerves. 
     
     
         3 . Novel arrangement of non-evaporable getters for a tube solar collector according to  claim 2 , wherein the nerves are equidistant. 
     
     
         4 . Novel arrangement of non-evaporable getters for a tube solar collector according to  claim 2 , wherein the nerves have variable thicknesses. 
     
     
         5 . Novel arrangement of non-evaporable getters for a tube solar collector according to  claim 4 , wherein the thinnest end of the nerves is the closest to the center of the cover. 
     
     
         6 . Novel arrangement of non-evaporable getters for a tube solar collector according to  claim 1 , wherein the cover has a variable thickness according to the different areas. 
     
     
         7 . Novel arrangement of non-evaporable getters for a tube solar collector according to  claim 1 , wherein the cover has a variable thickness and it also has nerves. 
     
     
         8 . Novel arrangement of non-evaporable getters for a tube solar collector according to  claim 2 , wherein the getter pellets adhere at the free space between the nerves. 
     
     
         9 . Novel arrangement of non-evaporable getter for a tube solar collector according to  claim 1 , wherein mirroring is made to an area of the outer glass tube. 
     
     
         10 . Novel arrangement of non-evaporable getter for a tube solar collector according to  claim 9 , wherein the mirroring can be applied directly to the inner face of the glass tube. 
     
     
         11 . Novel arrangement of non-evaporable getter for a tube solar collector according to  claim 9 , wherein the mirroring can be applied directly to the outer face of the glass tube. 
     
     
         12 . Novel arrangement of non-evaporable getter for a tube solar collector according to  claim 9 , wherein the mirroring is carried out by adding a film or a fine mirror to any of the inner or outer faces of the glass tube.