Heat exchanger for heating boilers

Abstract

A heat exchanger of the fumes-water type configured to couple with a burner for the manufacture of boilers for domestic or industrial use. The heat exchanger includes an exchanging body ( 2 ) made of die-cast aluminum with two half-shells ( 2 a and 2 b ), to be mounted in a mutually opposing fashion, and enclosed within a casing ( 3 ), made of a plastic or aluminum material, formed of two half-parts ( 3 a and 3 b ) to couple in order to contain therewithin the exchanging body, thus constituting two seats, one internal one for the flow of fumes and the other, external, one for the flow of water, which runs upwards from the bottom, passing all around the exchanging body with a partly parallel and partly spiral route. The exchanger is of the “cross flow” type, where the input on the water side corresponds with the heat exchanger fumes output and allows high heat exchange performance.

1 . A fumes-water type heat exchanger configured to be coupled to a burner for the production of boilers for domestic or industrial use characterised by the fact that the said exchanger is comprised essentially of an exchanging body ( 2 ) made of die-cast aluminium with two half-shells ( 2   a  and  2   b ) to be mounted mutually opposite and sealed by a casing ( 3 ) made of plastic or aluminium formed of two half-parts ( 3   a  and  3   b ) to be coupled to contain the exchanging body ( 2 ) therewithin so as to constitute two seats, one inside for the flow of fumes and the other outside for the flow of water. 
     
     
         2 . A heat exchanger according to  claim 1 , characterised by the fact that each half-shell ( 2   a  and  2   b ) has a structure ( 20 ) composed of an essentially U-shaped element inside which there is a plurality of fins ( 21 ) arranged in a reciprocally parallel fashion and parallel to the sides of the U and outside the U-shaped element, there is a plurality of blades ( 22 ) coming out in a perpendicular fashion and which are reciprocally parallel and parallel to the base of the U and perpendicular to the fins ( 21 ) and a series of small grooves ( 27 ) arranged in a reciprocally parallel fashion and alternating with the blades ( 22 ), when the said two half-shells are mutually coupled, the fins of the first half-shell fit into the space between the fins of the second half-shell, creating a small V-shaped chamber and the first and last fins are opportunely positioned so as to have a space for the corresponding fin of the other half-shell to fit in, in order to assemble the entire exchanging body with two facing half-shells. 
     
     
         3 . A heat exchanger according to  claim 1 , characterised by the fact that each half-part ( 3   a  and  3   b ) of the casing is substantially constituted of a C-shaped element inside which there is a series of dividers ( 31 ) also with a C-shaped conformation and which are arranged reciprocally parallel and spaced at slightly decreasing intervals in an upwards fashion while in the other half-part ( 3   b ) they are always reciprocally parallel and spaced at decreasing intervals in an upwards fashion, but have a conformation which envisages a first horizontal section ( 32 ) in an L shape located partly on the side of the C and partly on the wall, a second diagonal section ( 33 ) positioned upwards and a third section ( 34 ) which is horizontal again and positioned on the other side of the symmetrical C to the section ( 32 ) and at the free end of each divider ( 31 ) there is a projection ( 35 ) envisaged to fit into a groove ( 27 ) present on the external wall of the U-shaped element so as to create a route along which the water is forced to flow, with a spiral-shaped conformation, running from the bottom upwards and passing all around the exchanging body ( 2 ). 
     
     
         4 . A heat exchanger according to  claim 1 , characterised by the fact that each half-part ( 3   a  and  3   b ) of the casing is substantially constituted of a C-shaped element in which there is a series of dividers ( 31 ) alternating with the dividers ( 31   a ) where the dividers ( 31 ) have a C-shaped conformation and are endowed with a small vertical wall ( 38 ) positioned centrally and in a perpendicular fashion to each of the said dividers, while the said dividers ( 31   a ) have a break at the centre and in the half-part ( 3   a ) the dividers ( 31  and  31   a ) are arranged reciprocally parallel and spaced at slightly decreasing intervals in an upwards fashion while in the other half-part ( 3   b ) they are also reciprocally parallel and spaced at decreasing intervals in an upwards fashion, but between the two half-parts, the dividers ( 31 ) and, similarly, the dividers ( 31   a ) are reciprocally staggered by one level. 
     
     
         5 . A heat exchanger according to  claim 4 , characterised by the fact that, at the free end of each divider ( 31  and  31   a ) of each half-part ( 3   a  and  3   b ) of the casing, there is a projection ( 35 ) envisaged to fit into a groove ( 27 ) present on the outer wall of the U-shaped element of the exchanging body ( 2 ) so as to create a route along which the water is forced to flow, the conformation of which features parallel levels which make the water flow up on the side of the C to the top level and thus make the water run along a trajectory that is parallel in each half-part of the casing and which meets on each side of the casing, and then flows up to the top level, thereby flowing from the bottom upwards and passing around the exchanging body ( 2 ). 
     
     
         6 . A heat exchanger according to  claim 1 , characterised by the fact that each half-part ( 3   a  and  3   b ) of the casing is substantially constituted of a C-shaped element inside which there is a series of dividers which have different conformations in which the half-part ( 3   a ) of the casing is endowed with a first divider ( 31 ), located at the bottom, with a C-shaped profile and endowed with a small vertical wall ( 38 ) positioned centrally and in a perpendicular fashion, followed by a divider ( 31   a ) with a break at the centre, and by a series of dividers ( 31 ) with a C-shaped profile and the half-part ( 3   b ) envisages the presence of a first divider ( 31 ) with a C-shaped profile, a second divider ( 31   c ) with a C-shaped profile and endowed with a small vertical wall ( 38 ) positioned centrally and in a perpendicular fashion, followed by a divider ( 31   a ) composed of a horizontal section in an L shape positioned partly on the side of C and partly on the wall, and a series of consecutive dividers with a conformation that envisages a first horizontal section ( 32 ) which is positioned on the side of the C, like the divider ( 31   a ), a second diagonal section ( 33 ) positioned upwards and a third section ( 34 ) which is horizontal again and positioned on the other side of the symmetrical C and parallel to the divider ( 31   a ), with a last divider ( 31   d ) which envisages a first horizontal section ( 32 ) positioned on the side of the C, like the divider ( 31   a ) and a second diagonal section ( 33 ) positioned upwards. 
     
     
         7 . A heat exchanger according to  claim 6 , characterised by the fact that in each half-part ( 3   a  and  3   b ) all the dividers are arranged in a reciprocally parallel fashion and are spaced apart at slightly decreasing intervals in an upwards fashion. 
     
     
         8 . A heat exchanger according to  claim 6 , characterised by the fact that, at the free end of each divider of each half-part ( 3   a  and  3   b ) of the casing, there is a projection ( 35 ) envisaged to fit into a groove ( 27 ) present on the outer wall of the U-shaped element of the exchanging body ( 2 ) so as to create a route along which the water is forced to flow, the conformation of which initially features parallel levels which make the water flow up on the side of the C to the top level and the water runs along a trajectory that is parallel in each half-part of the casing and which meets on each side of the casing, and then continues flowing up to the upper levels so as to bring water from the bottom upwards. 
     
     
         9 . A heat exchanger according to  claim 2 , characterised by the fact that the half-part ( 3   b ) of the casing has two connectors on the side of the C, one being a lower one ( 40 ) via which the cold water enters, and the other an upper one ( 41 ) via which the hot water flows out. 
     
     
         10 . A heat exchanger according to  claim 2 , characterised by the fact that, at the bottom of the U-shaped element, there is an element ( 25 ) that creates a seat and a space to collect the condensation produced in the inner seat where the fumes pass, the said element being triangular-shaped and comprising a condensation discharge pipe ( 25   a ) and an opening ( 25   b ) for the discharge of the exhausted fumes that have passed within the two half-shells. 
     
     
         11 . A heat exchanger according to  claim 1 , characterised by the fact that the said exchanger is preferably made of aluminium or special aluminium alloys so as to resist corrosion, to have high thermal conductivity and be die-castable, the said alloys being of the low-melting type and requiring less energy to melt.