Sealing principle of inner expanding core tube of spiral air duct
When the inner expanding core pipe is installed, it is completely expanded by the pushing screw. The outer wall of the core pipe is closely connected with the inner wall of the air pipe, forming the opening of the first sealing surface, the end of the core pipe is closed by lining plate, forming the second sealing surface.
The rubber sealing ring is tightly pressed with the air duct wall to form a third sealing surface, thus meeting the sealing requirements of the core pipe connection reliably.
Operation of inner expanding core pipe for air pipe connection
Before installation, the "0" rubber sealing ring shall be tightly embedded in the "V" groove of the core pipe, and the two ends of the core pipe opening shall be overlapped to reduce the diameter, so that it can be easily placed into the opening of the pipe to be connected. During installation, the core pipe shall be expanded radially by means of the jacking screw. When the two ends of the core pipe are aligned exactly, the internal expansion operation shall be completed, and the core pipe wall and the air pipe wall have been closely connected, Then use self tapping screw or rivet to fix the core pipe and air pipe along the circumference to complete the installation opening.