公开(公告)号：US12065990B1

公开(公告)日：2024-08-20

申请号：US18471881

申请日：2023-09-21

Applicant: Raytheon Company

Inventor： John Rascon ,  Anthony V. Formica ,  Mark J. Meisner

IPC: F02K9/34 ,  F02K9/40 ,  F02K9/97

CPC classification number: F02K9/346 ,  F02K9/40 ,  F02K9/972 ,  F02K9/974

Abstract: An insulated blast tube includes an insulating layer of a burn resistant material such as phenolic resin formed on an interior surface of the blast tube to provide the necessary erosion and thermal insulation properties to protect the blast tube and a heavy inert gas insulated layer formed in the walls of the blast tube itself to provide the additional thermal insulation properties to protect any non-propulsive sub-systems positioned in the void space around the blast tube. A void space in the walls of the blast tube contains an inert gas such as Argon, Krypton, Xenon or a synthetic inert gas having a density of at least 1.5 kg/m3 and a thermal conductivity Tcond_gas of no greater than two-thirds the thermal conductivity of air Tcond_air to form the heavy inert gas insulation layer.

公开(公告)号：US20250101933A1

公开(公告)日：2025-03-27

申请号：US18471908

申请日：2023-09-21

Applicant: Raytheon Company

Inventor： John Rascon ,  Anthony V. Formica ,  John Regis Leach

IPC: F02K9/34

Abstract: A vacuum insulated blast tube includes an insulating layer of a burn resistant material such as phenolic resin formed on an interior surface of the blast tube to provide the necessary erosion and thermal insulation properties to protect the blast tube and a vacuum insulated layer formed in the walls of the blast tube itself to provide the additional thermal insulation properties to protect any non-propulsive sub-systems positioned in the void space around the blast tube. A void space in the walls of the blast tube is held under vacuum with a pressure of less than 25 Torr and a thermal conductivity Tcond_vac of less than one-third of the thermal conductivity of air Tcond_air to form the vacuum insulation layer.