Solar water heater tank inner container

Abstract

An inner shell of water tank of solar water heater is once molded by rotationally molding modified cross-linked polythene. The specific manufacture process comprises the following steps: adding modified cross-linked polythene powder into an integral steel mold; disposing the mold horizontally in an oven; heating while rotating simultaneously in both axial direction and radial direction with an axial rotation speed of 1 to 20 rpm and a radial rotation speed of 5 to 50 rpm; changing the rotation direction every 5 to 10 min; increasing the temperature in the oven to 160 to 260 DEG C within 10 min; keeping the temperature for 15 to 40 min; stopping heating; taking the mold out of the oven; cooling; rotating the mold until the surface temperature of the mold is reduced to 30 to 40 DEG C; opening one end of the mold; and taking out the inner shell. The inner shell made of metal substitute material can improve the heating efficiency of the solar water heater, reduce heat loss and prolong the heat preservation time, and has the advantages of acid and alkaline resistance, no corrosion, no fouling, no leakage, and prolonged service life.

Description

technical field [0001] The invention relates to a solar energy utilization technology, in particular to an inner liner of a solar water heater water tank. Background technique [0002] The development and application of solar water heaters has a history of more than ten years. All solar water heater inner tanks are made of metal or stainless steel inner tanks, polyurethane insulation, and metal shells. Its manufacturing process and technology are - shearing plate - punching - rolling into a drum - welding two broken end caps - welding water outlet connecting pipe - welding exhaust connecting pipe - welding overflow connecting pipe - Foam insulation for inner and outer barrels, etc. Its manufacturing process is complicated, there are many links, and there are many parts to be welded. The metal body will be oxidized after high-temperature welding. Due to the harsh environment of solar energy, the inner water tank is a container for water. In some areas, the water source is m...

AI Technical Summary

Problems solved by technology

Its manufacturing process is complicated, there are many links, and there are many parts to be welded

The metal body will be oxidized after high-temperature welding. Due to the harsh environment of solar energy, the inner water tank is a container for water. In some areas, the water source is more acidic and alkaline. As the use time goes by, the welded part will gradually oxidize and rust, and finally the water tank will be damaged. Water leakage until the entire water heater is scrapped, which affects the use effect and shortens the service life of the solar water heater

Moreover, the heat transfer of metal is fast, and the thermal insulation performance is poor.

At present, the metal inner tank of solar water heaters is made of imported stainless steel 304-2B materials. In recent years, the prices of imported stainless steel materials and polyurethane insulation materials have been rising every year, and the manufacturing cost of solar water heaters has increased year by year.

The price is 5-10 times higher than that of electric water heaters and gas water heaters, which has restricted the development of the industry and affected the purchasing power of consumers