Swimming pool cover and insulator - can be flooded to lie on bottom of pool or inflated to float on surface

摘要

The swimming pool cover has negative buoyancy to lie on the bottom of the pool but can be air-inflated to cause it to float. It is made of rectangular panels that consist of shells either with hollow interiors that can be inflated with air to float or filled with water to sink. Each may contain a lightweight, heat-insulating core material(12) and a chamber (13) filled with a heavy material such as sand and have a peripheral inflatable collar or air sac(16). If the upper surface of the cover is a heat-absorbing surface and water is lifted from the bottom of the pool and distributed over the cover while it is floating, an effective way of heating the pool water is also provided.