METHOD FOR MANUFACTURING A HEAT INSULATION HIGH-TEMPERATURE STRUCTURAL ELEMENT AND APPARATUS FOR CREATING A HEAT INSULATION LAYER ON THE BODY OF THE STRUCTURAL ELEMENT BY WINDING A FIBREGLASS TAPE Russian patent published in 2022 - IPC F16L9/12 

FIELD: insulation.

SUBSTANCE: invention relates to the technology for manufacturing heat insulation articles operated under high temperatures, and can be used to produce hollow high-duty structural parts. A heat insulation material in the form of a thick fibreglass tape with a thickness of 0.1 to 0.4 mm is used as winding material, said tape being wound on the rotating body of the structural element in an amount of at least 10 layers. A rotating hollow cylindrical body consecutively pretreated over the outer surface with degreasing solvents — gasoline, then acetone, is used as the body of the structural element. Said body is made with a groove along the outer surface forming endwise annular protrusions with the height not exceeding the thickness of the created layer of heat insulation coating, and the width of the groove, as well as the width of the protrusions, are selected on the basis of the mathematical condition of ensuring the minimum heat conductivity of the created heat insulation layer. The body herein is rigidly secured on supports installed on a fixed base, configured to rotate around the main geometric axis thereof. An anti-adhesive layer of polyimide film is then wound onto the created heat insulation layer, and a fixative layer of twilled tape is wound on top of said film layer; the structural element body with the wound-on heat insulation layer undergoes heat treatment under the conditions of stage heating according to the following scheme: stage 1 — temperature rise to 85–95 °C; stage 2 — temperature rise to 115–125 °C, holding for at least 2 h at each stage; stage 3 — temperature rise to 155–165 °C, holding for at least 5 h, at a rate of temperature rise at each stage within 15–20 °C/h; in the process of drying at stage 1, the body of the structural element is periodically rotated with a regular reverse at an angle of at least 180 degrees every 15 to 20 minutes. Described is an apparatus for creating a heat insulation layer on the body of a structural element by winding a fibreglass tape.

EFFECT: higher accuracy of realising geometric and physical (strength, heat resistance, density) parameters in the finished product.

2 cl, 1 dwg