FR2966560A1 - Flue pipe for use with stove in residential building, has assembly including cooling and heat recovery system fixed on large central pipe made of metal e.g. stainless steel, where system recovers heat by diffusion - Google Patents

Abstract

The pipe has an assembly including a cooling and heat recovery system fixed on a large central pipe made of metal such as stainless steel or cast iron, where the system recovers heat by diffusion. The assembly is fixed firmly to a wall and/or a floor by fixing lugs. A copper pipe is wound contiguously over the entire length of the central pipe, where water flows through the copper pipe. The copper pipe and the central pipe are welded together by two rings at the ends of the pipes.

Description

Smoke hoses against burns and heat recovery 25/10/2010 13:24

The present invention relates to smoke pipes for living quarters with heating using a fuel. Currently the pipes are galvanized steel, stainless steel, or painted steel. They are not designed to protect people from burns. They are dangerous. They do not diffuse the heat they contain to living rooms because they do not create a convection of the ambient air. Although there is an old patent that should have improved the state of the art, this patent did not give rise to products marketed in a visible manner. I would blame this patent that the junction between the central pipe and the diffusion system is based on too close contacts. In my pipes the transfer of heat between the inner surface and the cooling system is optimized. Metals lead heat very well and by increasing the contact surface between air and metal, the air in the home is warmer. The current pipes let all this heat leave the premises. On the other hand the steel of the current pipes is very thin and in return they are therefore light. But they can dislodge accidentally because of their lightness and cause fatal poisoning if everyone falls asleep without noticing that we shoved the stove. In many dwellings the fumes pass through masonry which recent laws have forced to gain. Masonry is indeed porous and likely to split. Suddenly the fumes do not communicate at all their heat to the rooms of the house. It would be better to destroy these lightweight brick masonries and replace them with thick steel pipes to ensure a long life. On these pipes there would then be a cooling system and protective clothing against burns. This invention does not relate to certain sulfur fuels that emit acidic and corrosive fumes. The need to protect the inside of the pipe with enamel calls into question the use of such fuels, because of the cost of this enameling. This invention does not concern houses with central heating in a boiler room. In this case the combustion air must be preheated by the fumes that are rejected. This state of the art already exists.

My pipes are heavy and thick. These pipes must be rigidly fixed to the walls or placed on feet to prevent them from accidentally unloading. They have wall brackets, end caps, or feet, or both. The central pipe is smooth inside and round so as not to disturb the sweeping. It is the inside diameter required by the home and vertical manufacturer. There is solution I with natural convection of the ambient air if space is available and solution II with water when there is little space around the pipe. But in all cases there is a cover so that the heat of the pipe outside never exceeds 50 ° C so that we can not burn accidentally. I) ambient air

They use natural convection to extract the heat of the fumes in the absence of electricity. It is stupid in case of power failure to be unable to heat because of the very low power consumption of an installation that requires electricity. In addition they avoid the noise of a small fan.

To do this they generate hot air columns that convection naturally. The longer the hot air column, the faster the air is climbing. The higher the speed of ascension, the better the air will be mixed in the living room. Below a certain diameter, the turbulence on the walls of these air columns hinders convection. Above a certain diameter the mixing between the ambient air and the hot metal becomes bad again. There is therefore an optimum to find. So they have vertical cooling fins welded to the central pipe if it's steel or molded with the pipe if it's cast iron. Figure 4 shows the profile view of this type of pipe. The air between the first and the second envelope enters the stove, and leaves a little before the ceiling by natural convection. The second envelope is screwed or crimped on the fins. The length and number of fins are calculated to bring the temperature of the second envelope to 50 ° C maximum. This is seen in section in Figure 1. In Figure 2 we see an easy solution to manufacture which consists of crimping copper pipes large diameter, or pipes anodized aluminum, between the fins of a steel tube. These outer pipes are joined and do not allow to burn on the central pipe. These two solutions are equivalent and only differ for reasons of ease of supply of elementary components or aesthetics.

For chimneys or for convenience, the second envelope may be a half-cylinder. On the other hand, the smoke duct is always round for sweeping. He is clinging to the wall. We see this kind of solution in section in Figure 3. The connection of the inner pipe with the masonry of the chimney must be made to the refractory mastic. The inner pipe must never be sheathed, it is absolutely waterproof. Any extension ducts must be crimped onto the inner pipe. The thickness of the pipe guarantees its sealing for many years. To examine are state disassemble the dressing. The second envelope is decorated with materials that lead the heat well. The most economical material for the inner pipe is steel thick enough to easily weld the cooling fins. But one can possibly use the font if the number of orders of a piece with the same dimensions becomes sufficient. The weld bead participates in the heat transfer. It is necessary to find a compromise between the cost of the weld and the interest of getting closer to a formation that conforms to that of the mathematical problem of solving the equation of diffusion of heat. The cooling fins are also made of steel if they are welded. The outer pipe is made of anodized aluminum or copper to be lightweight, good heat conductor and decorative. II) water

A) If the diameter of the central pipe is not too large compared to the cost of stainless steel, a stainless steel pipe is placed inside a second stainless steel pipe. For example, around a 2-inch-diameter stainless steel pipe is attached a pipe 3 inches in diameter. The two pipes are fitted together by the rings of the ends which are welded sealingly to the two pipes. To circulate water between the two pipes there is at each end a small pipe with a thread to fix a heating water installation. These two small pipes are welded to the second envelope pierced at this location. This is Figure 5 B) Around a central steel pipe, a small copper pipe is wrapped over the entire length. Some brackets welded to the steel pipe allow the copper pipe to be securely fastened. This is Figure 6. In Figure 7 we see an addendum taken on the internet about burns. - 3 seconds (7 for an adult) to cause a child a 3rd degree burn with water at 60 ° C, - 1 minute (8 for an adult) if the water is at 50 ° C. This temperature may therefore be the upper limit from which the burns caused begin to be serious.

Claims (8)

1) The invention consists of a smoke pipe comprising a large central metal pipe. On this large pipe is fixed a cooling system and heat recovery by diffusion. This set is equipped with a dressing. The assembly is securely fastened to the wall or floor or both, by brackets. 2) Cooling system according to claim 1, which must be calculated so that the heat of said dressing does not exceed 50 ° C. 3) Central pipe according to claim 1, characterized by a conduit which is cylindrical and which is the diameter recommended by the manufacturer of the fireplace. 4) The cladding of claim 3, consists of a copper pipe wound contiguously on the pipe of the steel fumes. In this pipe circulates water which is the so-called cooling system. 5) central pipe according to claim 3 which is made of stainless steel. The cladding is a second stainless steel pipe all around. They are welded together tightly by two rings at the ends. There is a tip at each end to let water in and out of said cooling system. 6) Central pipe according to claim 3 which is thick steel or cast iron. Said cooling system consists of vertical fins welded or molded with the pipe. 7) The cladding according to the invention 6 which consists of large diameter copper pipes, or anodized aluminum pipes, parallel to the central pipe between the fins. These pipes are strongly pressed against the fins and the central pipe by regularly spaced bands. 8) The cladding according to the invention 6 which is a second thin pipe preferably anodized aluminum which surrounds all the fins.