WO2009002137A1 - Water heater - Google Patents

Abstract

The present invention consists in a storage or rapid-recovery water heater, which contains at least one steam pipe and within the pipe, contains a detachable heat recoverer, which in the centre contains a square or rectangular piping unit and wherein the following are solder attached; an undulated sheet on each side of said unit, the four sheets having at least three undulations and with undulations optionally in transverse position or with an intermediate angle between the transverse position and the position aligned with the axial axis of the steam pipe. The present water heater can be built without the square or rectangular piping unit and can contain only two undulated sheets; it can also contain three, five, six or eight undulated sheets, which are interconnected with soldering points; it can also be formed by a cylindrical tube, which has undulations formed on the wall of said tube.

Description

 WATER HEATER

FIELD OF THE INVENTION

The present invention consists of a heat recovery device that is applied in fast recovery and storage water heaters, of which contain smoke pipes and vertical operation, for residential and commercial use.

BACKGROUND OF THE INVENTION

Currently, the water heaters of smoke pipes, storage and rapid recovery for residential and commercial use, still have some deficiencies as explained below: storage heaters have a very low thermal efficiency and in those of rapid recovery is required a very complicated construction so that they reach a high thermal efficiency, since the most effective technique that is currently known is that of welding a large number of fins inside the smoke pipes; because the smoke pipes that do not contain fins, have to be very long and still a high thermal efficiency is not achieved. The object of the present invention is to provide a removable heat recovery device, which is easy to build and easy to place inside the smoke pipes, which is applied in fast recovery and storage water heaters , for residential and commercial use.

A further object of the present invention is to provide a heat recovery device that has an efficiency equivalent to heat recuperators containing fins, therefore, a water heater that is provided with the present heat recovery device reaches high thermal efficiency, equal to or greater than heaters containing fins, but with a much simpler construction.

A further object of the present invention is to provide a heat recovery device which, because it is removable, can be applied to water heaters that are already in use and thus can save fuel gas, which is relevant for users and for the environment in general.

More information is provided in the detailed description of the invention. BRIEF DESCRIPTION OF THE FIGURES

Figure 1 shows the tank of a storage water heater, which contains inside a smoke pipe.

Figure 2 shows a plan view of a smoke pipe and inside it there is a square tubular and four corrugated sheets.

Figure 3 shows the longitudinal section of a smoke pipe and inside there is a square tubular and three corrugated sheets.

Figure 4 shows the longitudinal section of a smoke pipe and in its interior the profile of two corrugated sheets opposed to each other can be seen.

Figure 5 shows the longitudinal section of a smoke pipe, which contains inside a cylindrical tube that has the undulations formed in its own wall. DETAILED DESCRIPTION OF THE INVENTION

The description of the present invention has illustrative, non-limiting purposes, reference is also made to the accompanying figures and numerical signs.

Figure 1 shows as an example the tank 1 of the water heater mentioned here, which contains a smoke tube 2 and in the tube 2, is where the heat recovery device proposed here is introduced. The present water heater can contain from at least one tube 2 and up to the quantity of tubes 2 that are required depending on the design power of the heater.

Figure 2 shows a plan view of the smoke pipe 2 and in its interior the heat recovery device proposed here is shown, which consists of a square tubular 3, two corrugated sheets 4 and two corrugated sheets 5.

Figure 3 shows a longitudinal section of the smoke pipe 2, which contains in its interior the heat recovery device proposed here and a square tubular 3 and the profile of two corrugated sheets 4 can be seen, in addition it contains two corrugated sheets 5 , whose undulations are identical to those undulations of the sheets 4. The square tubular 3 has the closed lower end, so that the combustion gases flow only through the four passageways that are formed between the inner wall of the tube 2 and the four corrugated sheets 4 and 5; the two corrugated sheets 4 are preferably wider than the square tubular 3 and therefore are also used to keep the heat recovery device radially centered inside the tube 2 and the two corrugated sheets 5, have the width preferably equal to the width of the Tubular square 3 as seen in Figure 2 and thus constitutes an approximately square heat recuperator. As can be seen in the present figure, the four corrugated sheets 4 and 5, have the undulations in transverse position with respect to the axial axis of the tube 2 and when the flue gases flow in axial direction, in each undulation of the sheets 4 and 5 turbulence is formed that increases heat transfer to the inner wall of tube 2; the four corrugated sheets 4 and 5 are fixed to the square tubular 3 preferably with welding points and at the upper end of the square tubular 3, a crossbar that can be manufactured with sheet or steel wire is fixed with welding, which is required to hold the heat recovery device vertically inside the tube 2. The square tubular 3 is not limiting, because it can be shaped rectangular or cylindrical, in which four corrugated sheets 4 and 5 with the corresponding width are also placed. Alternatively, the square or cylindrical rectangular tube 3 can be dispensed with and the four corrugated sheets 4 and 5 are fixed together with welding points; in this case the corrugated sheets 4, being the widest, are made a 90 ° bend in a small part thereof at the upper end, so as to form a lid on the heat recuperator and at the bottom the two sheets 4 are connected to each other in the form of a wedge, as seen in the present figure and thus the combustion gases are diverted to flow through the four passage areas.

Figure 4 shows a longitudinal section of the smoke pipe 2 and in its interior another embodiment of the present heat recovery device is appreciated, which is constituted by two corrugated sheets 6, whose profile is seen in the present figure; The present heat recovery device is suitable for use in relatively long smoke pipes, where it is not necessary to apply the heat recuperator shown in Figures 2 and 3. As can be seen in the present figure, the two corrugated sheets β are placed with the undulations opposed to each other and fixed with welding points and thus two passage areas are formed between the two corrugated sheets 6 and the inner wall from tube 2, so that flue gases flow through them; furthermore, at the top of the present heat recuperator, a sheet or wire crossbar is required to hold it vertically inside the tube 2. The present heat recovery device which is constituted by two sheets 6, is not limiting, because also it can be constituted by at least three corrugated sheets and thus constitutes a triangular shaped heat recuperator, or it can be constituted by five corrugated sheets, six corrugated sheets or eight corrugated sheets,

U to form heat recovery devices in a pentagonal, hexagonal and octagonal manner respectively, in which the undulations of the sheets are transverse with respect to the axial axis of the tube 2. The heat recuperators5 which are constituted by three sheets, five sheets, six sheets or for eight sheets, they can each have in their center, a cylindrical tube to fix the corrugated sheets in it, or they can have a tubular of the corresponding shape, that is, the tubular can be triangular, pentagonal, hexagonal or octagonal respectively , or said tubular can be dispensed with in the center of the heat recuperators and the sheets are fixed together with welding points.

Figure 5 shows one more mode of the device heat recovery proposed here, which consists of a longitudinal section of the smoke pipe 2, which in turn contains inside a cylindrical tube 7, which has both ends closed and has a smaller diameter than the pipe smoke 2; the cylindrical tube 7 has the undulations formed in its own wall, as can be seen in the present figure and has the undulations in a transverse position with respect to the axial axis of the tube 2 and in each undulation there are turbulence in the flue gases flowing through the annular passage area, which is formed when the cylindrical tube 7 is placed inside the smoke tube 2. The undulations of the cylindrical tube 7, can be formed in a normal steel tube having the thin wall, or the complete cylinder with ceramic by means of a mold and the ceramic cylinder must have the undulations already integrated in its structure. As can be seen in the present figure, the cylindrical tube 7 requires at least four guides at each end to center it inside the tube 2 and also requires in its upper part a crossbar to hold it vertically inside the tube 2, which They can be manufactured with sheet or steel wire.

The heat recovery devices described in Figures 2, 3, 4, and 5 all contain at least three corrugations in each of its sheets including the cylindrical tube 7 of Figure 5 and the amount of the corrugations may vary in each heat recuperator depending on the design characteristics chosen therein, because the greater the number of corrugations, The heat transfer coefficient is higher, but this increases the friction in the flow of flue gases through the heat recuperators and vice versa. In addition, the undulations in transverse position with respect to the axial axis of the tube 2 as described in all heat recuperators, is not limiting, because in the sheets of all heat recuperators and in the cylindrical tube 7 of Figure 2, the undulations may be formed at an intermediate angle between the transverse position and the aligned position with respect to the axial axis of the tube 2.

PREFERRED EMBODIMENT OF THE INVENTION

An example of a storage water heater according to Figure 1 is provided, which contains inside a smoke pipe having an inner diameter of 70 mm. And a length of 600 itim; the tube contains inside a removable heat recovery device according to figures 2 and 3. The present water heater reaches a thermal efficiency of 88% with respect to the calorific value Lower fuel gas and the burner has a power of β kw. At sea level.

The present description is not limiting, as additional modalities will become apparent upon reading the description and the claims without thereby departing from the spirit of the invention.

Claims

CLAIMS Having described my invention sufficiently, I consider it a novelty, therefore I claim as my exclusive property the content of the following clauses. 1. Water heater, of which are called smoke pipes, which contains at least one tube inside; characterized in that inside the tube, it contains a removable heat recovery device, which is constituted by a square tubular and four corrugated sheets, one on each side of the square tubular, also because each of the corrugated sheets contains at least three corrugations , in addition because the four corrugated sheets have the undulations in transverse position with respect to the axial axis of the smoke pipe, in addition because two corrugated sheets are wider than the square tubular and the other two corrugated sheets have a width equal to the square tubular, in addition because the two corrugated sheets that are wider than the square tubular, also serve to radially center the heat recovery device inside the tube, also because the heat recovery device contains in its upper part a sheet or wire crossbar for Hold it vertically inside the tube. 2. Water heater according to clause 1, characterized in that the square tubular is a rectangular tubular and contains four corrugated sheets with the corresponding width. 3. Water heater according to clause 1, characterized in that the square tubular is a cylindrical tube and contains four corrugated sheets with the corresponding width. 4. Water heater according to clause 1, characterized in that the heat recovery device is constructed without the cylindrical tube and without the rectangular or square tubular in the center thereof and the four corrugated sheets are fixed together with welding points. 5. Water heater according to clause 1, characterized in that the heat recovery device consists only of two corrugated sheets that are fixed together with welding points, whose ripples are placed opposite each other. 6. Water heater according to clause 1, characterized in that the heat recovery device has a triangular, pentagonal, hexagonal and octagonal shape, the which consists of three corrugated sheets, five corrugated sheets, six corrugated sheets and eight corrugated sheets respectively, which are fixed together with welding points. 7. Water heater according to clause 1, characterized in that the heat recovery device is constituted by a cylindrical tube, which has the undulations formed in the wall thereof. 8. Water heater according to clause 1, characterized in that the heat recovery device that is constituted by a cylindrical tube, is made of ceramic by means of a mold and has the transverse ripples already integrated in its structure. 9. Water heater according to clause 1, characterized in that the corrugated sheets have the undulations formed with an intermediate angle between the transverse position and the aligned position with respect to the axial axis of the tube 2.