Novel marine thermal insulation spiral duct

Abstract

The invention relates to a novel marine thermal insulation spiral duct. The novel marine thermal insulation spiral duct is composed of an outer pipe, a middle heat preservation pipe and an inner pipe, wherein the outer pipe, the middle heat preservation pipe and the inner pipe are sequentially and coaxially connected with one another in a sleeved mode from outside to inside, the outer pipe and the inner pipe are made of metal plates respectively, and the middle heat preservation pipe is a pipe made of modified phenolic resin foaming heat preservation materials. The modified phenolic resin foaming heat preservation materials which are adopted are low in heat conductivity coefficient which generally ranges from 0.025W / m*k to 0.040W / m*K, good in heat preservation performance, difficult to combust, capable of self-extinction, less in smoke, capable of resisting flame penetrating, free of drippings when catching fire, low in toxicity, harmless to human bodies, and good in heat stability, and can be used for a long time at the temperature ranging from 140 DEG C to 160 DEG C. The modified phenolic resin foaming heat preservation materials are strong in corrosion resistance, and can resist erosion caused by all types of mineral acid, organic acid and organic solvents except for strong alkali. The foaming heat preservation materials have good closed pore structures, are low in water absorption and strong in capacity for preventing steam infiltration, cause no moisture condensation when used for preserving coldness, and are matched with the integral structure of the inner pipe and the outer pipe, stable in overall size, low in change rate, high in structure strength, safe to use and not prone to deformation, and the change rate is smaller than 1% with the use temperature range.

Description

technical field [0001] The invention relates to an air duct, in particular to an adiabatic spiral air duct suitable for central air-conditioning ventilation in the modern shipbuilding industry. Background technique [0002] As an essential part of the central air-conditioning ventilation in the modern shipbuilding industry, the adiabatic spiral air duct is constantly updated with its materials and manufacturing process along with the continuous progress and development of science and technology. Traditional ventilation pipes are processed on-site with galvanized steel sheets, and thermal insulation materials such as rock wool or ultra-fine glass wool are used for heat preservation. Harmful dust will be generated during processing and installation, which is harmful to human body, relatively poor heat preservation effect, and increases the weight of the hull . The existing central air-conditioning ventilation ducts are assembled on-site with heat-insulating spiral ducts. The ...

AI Technical Summary

Problems solved by technology

Rock wool is used as thermal insulation material. Rock wool has strong water absorption, and it is easy to absorb water and deform when used in thermal insulation, so that the proper thermal insulation effect cannot be achieved, and there are phenomena of running cold and corroding the steel plate; rock wool is enriched mechanically or manually In the middle of the two-layer spiral air duct, due to the fiber characteristics of rock wool, its compactness is not enough, and condensation will occur after long-term vibration and use; the organizational structure of rock wool determines that its mechanical strength is not enough, and the strength of the air duct is poor; The fireproof performance of rock wool can reach Class A, but because of its serious harm to the human body, there are carcinogenic problems. Some developed countries have strictly restricted the use of rock wool. Long-term inhalation of rock wool dust can lead to endobronchial inflammation and pulmonary emphysema. swelling, contact dermatitis and other symptoms; the production of rock wool consumes a lot of energy, and the raw materials need to be remelted and fibrous, which will generate a lot of waste water, waste gas, and consume a lot of energy. It is a high energy consumption and high pollution industry.

Images