Double-walled structure and connection arrangement

A double-walled structure, having at least one connection end portion, comprising:

• an inner tube having a free end at said connection end portion of the structure;
• an outer casing spaced from and enclosing said inner tube and having a free end at said connection end portion of the structure;
• a filler material provided between said inner tube and said outer casing;
• and
• a resilient sealing ring means provided between said inner tube and said outer casing,
• wherein said sealing ring means fills out the space between said end portion of the inner tube and a portion of the outer casing opposite thereto,
• wherein only the outer casing free end defines said connection end portion of the structure for slip fit connection to another double-walled structure, and
• wherein the outer casing connection end portion is a female portion designed for receiving a male portion of an outer casing of another double-walled structure, the free end of the inner tubing being retracted within the outer casing.

A double-walled structure, having at least one connection end portion, comprising:

• an inner tube having a free end at said connection end portion of the structure;
• an outer casing spaced from and enclosing said inner tube and having a free end at said connection end portion of the structure;
• a filler material provided between said inner tube and said outer casing;
• and
• a resilient sealing ring means provided between said inner tube and said outer casing,
• wherein said sealing ring means fills out the space between said end portion of the inner tube and a portion of the outer casing opposite thereto,
• wherein only the outer casing free end defines said connection end portion of the structure for slip fit connection to another double-walled structure, and
• wherein the outer casing connection end portion is a male portion designed for insertion into a female portion of an outer casing of another double-walled structure, the free end of the inner tubing being retracted within the outer casing.

A connection arrangement for coupling together of two double-walled segments for use in a ventilation duct system, of said segments one segment comprises a male connection end portion and the other segment comprises a female connection end portion said segments each including

• an inner tube having a free end at said connection end portion of the segment;
• an outer casing spaced from and enclosing said inner tube and having a free end at said connecting end portion of the segment;
• and
• a filler material provided between said inner tube and said outer casing,
• the segment Male and female connection end portions being interconnected for coupling together of the two segments,
• wherein the ends of the inner tubes facing each other have a gap therebetween,
• wherein the outer casings have a respective male and female portion interconnected with an overlapping slip fit,
• wherein a resilient seal means is arranged in a space between the inner tube and outer casing of at least one of the segments filling out said space, and
• wherein the resilient seal means protrudes from said space between the inner tube and the outer casing of each one of the segments, which seals meet in the gap (G), closing the gap (G) off.

A connection arrangement for coupling together of two double-walled segments for use in a ventilation duct system, of said segments one segment comprises a male connection end portion and the other segment comprises a female connection end portion, said segments each including

• an inner tube having a free end at said connection end portion of the segment;
• an outer casing spaced from and enclosing said inner tube and having a free end at said connecting end portion of the segment;
• and
• a filler material provided between said inner tube and said outer casing,
• the segment male and female connection end portions being interconnected for coupling together of the two segments,
• wherein the ends of the inner tubes facing each other have a gap therebetween,
• wherein the outer casings have a respective male and female portion interconnected with an overlapping slip fit,
• wherein a resilient seal means is arranged in a space between the inner tube and outer casing of at least one of the segments filling out said space, and
• wherein the resilient seal means protrudes from the space between the inner tube and the outer casing of one of the segments into the space between the inner tube and the outer casing of the other one of the segments.