Radiator unit for heating plants

Abstract: The radiator unit to be formed by assembling of three preliminar parts: 1) an upper die forming body with two wrapping parts (1) with counterposed diffuser fins (2 and 3) and with threaded mouths (4) forming the ends of the horizontal pipe (5) in which opening two channels (6) of beginning of the vertical pipe formed by pieces of conduit with setting out parts (7) and clutches (8); 2) a pair of bodies in aluminum draw piece (9), to be put in interposition, having in their vertical pipe (10) a steel pipe (11); 3) lower die forming body with wrapping parts (12) with counterposed diffuser fins (13 and 14) with threaded mouths (4) forming the ends of the horizontal pipe (5) in which opening two channels (6) of beginning of the vertical pipe formed by pieces of conduit with setting out parts (15) and clutches (16). Placed in reference-position on bed the three preliminar bodies, the radiator unit is to be formed under press with an only assembling phase to determine the insertion of the clutches (8 and 16) of the channels (6) into the upper and lower mouths of the vertical pipes (10) with stabilization moreover given by the come out outline sectors of the two pair of diffuser fins (2-3 and 13-14) which come to contain the couple of ends of the aluminum draw pieces (9).

Description: The invention refers to a bimetallic radiator unit as defined in the preamble of claim 1. Such a radiator is known for instance from EP-A1-0 481 154 for heating plants made without weldings. The invention achieves, in comparison with the known prior art, a considerable cut in the manufacturing costs and also a bigger corrosion strenght on the mouths of the vertical pipes. Said improvements to be obtained by using a structural body forming the vertical pipe consists of an aluminium draw piece in the inner channel of which is inserted by pressure a steel pipe of the same lenght. Moreover to form said radiator unit two aluminium alloy bodies are provided, to be made by pressure casting, in form of horizontal pipes having vertical pipes extending downwards to be axially inserted into the last part of the channels of the interposed aluminium draw pieces. The radiator unit is to be formed under press by assembling the three parts with axial blocking of the vertical pipes extending downwards inside the mouths of the inner channels of the central bodies. From the European Patent Application no. 96830380.0 is known a working which consists of the moulding of a steel tubolar core to be formed for welding of the flattened ends of two parallel pieces of pipes with end parts converg ing simmetrically to outward. Said steel core to be placed on pins into a pressure casting mould so to obtain , with the formation of the covering part in aluminium alloy, a preliminary bimetallic working body to be let in the following workings on feed line. In said workings at first a couple of cutter units come to act. Said cutter units, advancing into the horizontal pipes, work the removal on the pipe borders of the coming out end parts of the tubolar core. Then, secondly, the knurling is made on the pipe inside mouths so carrying away the residuals. At the end, the threads are made on the external mouths so permitting the assembling of the units by using known threaded pieces put like inside pipe-fitting of the horizontal pipes. The above cited working, producing the present known radiators of bigger assurance from the manufacturing point of view, has the drawbacks of high raw materials costs and high working costs while, from the use point of view, the presence, connected with the inside mouths of the horizontal pipes, of two materials with different corrosion coefficient, like the steel of the vertical pipes and the aluminium alloy of the pressure casting covering, determines for puking the formation of grooves acting like flow slowdown and like decay of the same radiator. Another manufacturing system, as described and shown in the Italian Patent Application BO97A 000336, teaches to actuate, into a pressure casting mould, a preliminar working aluminium body in which to longitudinally engloble a steel conduit for the vertical pipe. Said second system permits an important cut of the manufacturing costs by actuating a new kind of vertical pipe with only one channel and comes to elminate both the first working to form the core with parallel pieces of pipe than the following working of cutting and knurling but, from the use point of view, it presents the same drawbacks of the system described in the European Patent Application no. 96830380.0. It is to be remarked that the current technology in this field considers irrational to use steel for making both the horizontal pipes than the vertical ones for the high costs and for the drawbacks coming from infiltrations taking place in the welding parts and from the unsuitable use of an only one steel piece of conduit to form the inside mouths of the horizontal pipes. This because the occuring of a differentiated corrosion of the bimetallic parts rather than operates like a reinforcement of the body quickens its decay. The present invention creates a new radiator unit having a structural strengthening on the inside mouths of the pipes by forming a coaxial compound structure coming out from the fitting up of the vertical pipes extending downwards from the horizontal pipes into the mouths of the vertical pipes. The realized radiator unit permits, moreover, a high cut of the raw material costs and a cut of the working cost s such as it actuates a radiator unit to be formed for only assembling of three parts. Of said three parts, two ones in aluminium alloy, to be realized by pressure casting, in form of horizontal pipes, so greatly reducing the part to be made by hot pressing, while the third part consists of a aluminium draw piece, to be obtained for cut from a semi-manufactured product, and determines the vertical pipe being the smaller corrosin strength, given to the aluminium, obviates by the setting out in its inner channel of a steel pipe. The new radiator unit is to be formed by an only assembling phase. The invented radiator unit is to be formed by assembling of three prearranged parts: a) an upper die forming body with wrapping part 1 in the form of a horizontal pipe 5 with counterposed diffuser fins 2 and 3, lower forming coming out sectors, with said pipe 5 having at its ends threaded mouths 4 and having two openings in the form of vertical pipes 6 extending downwards with recessed portions 8 at the ends of their walls 7; b) a couple of bodies 9 in aluminium draw pieces, to be put in interposition, comprising inner channels 10 in which steel pipes 11 are inserted; c) a lower die forming body with wrapping part 12 in the form of a horizontal pipe 5 with counterposed diffuser fins 13 and 14, upper forming coming out sectors, with said pipe 5 having at its ends threaded mouths 4 and having two openings in the form of vertical pipes 6 extending downwards with recessed portions 16 at the ends of their walls 15. Placed in position the three cited bodies, the radiator unit is to be formed under press with an only assembling phase determining the insertion of the recessed portions 8 and 16 of vertical pipes 6 into the mouths of the inner channels 10 of the couple of aluminium bodies 9 in which steel pipes 11 are inserted. In this assembling the stabilization is moreover given by the coming out sectors of the two couples of diffuser fins 2,3 and 13,14 which come to contain the end parts of the aluminium body 9. Each interposed body 9 is to be formed from an aluminium draw piece and with pressure insertion of a steel pipe 11 of the same length inside its channel pipe 10. In a second embodiment the radiator unit is formed of an upper wrapping part 1 and of a lower wrapping part 12 having three diffuser fins 2, 3 and 13, 14, three vertical channels 6 extending downwards with recessed portions 8 and 16. The three separed bodies and the final radiator unit are illustrated in the drawings of sheets 1, 2, 3, 4, 5, 6, 7 and 8. In sheet 1 the upper die forming body with wrapping part 1 is illustrated in section views. In detail figure 1 is transversal section view of said upper body in correspondance of one of the vertical pipe 6 extending downwards. Figure 2 is longitudinal section view of the upper body. Figure 3 is section view of the upper body bewildered of 90° in comparison with the view of figure 2 to show the couple of vertical pipes 6 extending downwards. In sheet 2 the upper body is illustrated from outside. In detail figure 4 is a lateral view. Figure 5 is a lateral perspective view. Figure 6 is perspective view from the other side. In sheet 3 the lower die forming body with wrapping part 12 is illustrated in section views. In detail figure 7 is transversal section view of said lower body in correspondance of one of the vertical pipe 6 extending downwards. Figure 8 is longitudinal, section view of the lower body. Figure 9 is section view of the lower body bewildered of 90° in comparison with the view of figure 8 to show the the couple of vertical pipes 6 extending downwards. In sheet 4 the lower body is illustrated from outside. In detail figure 10 is a lateral view. Figure 11 is a lateral perspective view. Figure 12 is perspective view from the other side. In sheet 5 is illustrated the body 9 in aluminium draw piece forming the central part with the channel. In detail figure 13 is perspective view of the body 9. Figure 14 is view from the top. Figure 15 is front view of the same. In sheet 6 the parts of the radiator unit for heating plants are illustrated in the different phases of the assembling. In detail figure 16 is perspective view of the aluminium body 9 with the steel pipe 11 before to be inserted inside its channel 10. Figure 17 is perspective view of the aluminium body 9 having inside its channel 10 the steel pipe 11. Figure 18 is perspective view of the upper die forming body with wrapping part 1 and of the lower die forming body with wrapping part 12 in a theorical disposition before the assembling phase to be realized under press. Figure 19 is perspective view of the bodies to form the radiator unit in a second embodiment. In sheet 7 figure 20 is longitudinal section view of a radiator unit for heating plants realized on the base of the present invention to show the recessed portions 8 and 16 inserted into the channel 11 having in its inside the steel pipe 11. In sheet 8 figure 21 is perspective view of a radiator unit for heating plants with the upper die forming body (1,2,3) and the lower die forming body (12, 13, 14).

Claims: Radiator unit for heating plants consists of a body in aluminium alloy with vertical steel pipes; characterized in that : it is formed by assembling of an upper die forming body (1,2,3), a couple of bodies (9) in aluminium draw pieces and a lower die forming body (12,13,14); and in that the upper die forming body (1,2,3) consists of a wrapping part (1) in the form of a horizontal pipe (5) having outer counterposed diffuser fins (2,3), lower forming coming out sectors, where the horizontal pipe (5) has at its ends threaded mouths (4) and has two openings in the form of vertical pipes (6) extending downwards and having recessed portions (8) at the ends of their walls (7); and in that the couple of bodies (9) in aluminum draw pieces, to be put in interposition, comprises inner channels (10) in which steel pipes (11) are inserted; and in that the lower die forming body (12,13,14) consists of a wrapping part (12) in the form of a horizontal pipe (5) having outer counterposed diffuser fins (13,14), lower forming coming out sectors, where the horizontal pipe (5) has at its ends threaded mouths (4) and has two openings in the form of vertical pipes (6) extending downwards and having recessed portions (16) at the ends of their walls (15). Radiator unit for heating plants, according to claim 1, characterized in that placed in position the upper body (1,2,3), the couple of central aluminium bodies (9) and the lower body (12,13,14), the radiator unit is to be formed under press with an only assembling phase to determine the fitting up of the recessed portions (8,16) of the vertical pipes (6) into the mouths of the inner channels (10) of the couple of aluminium bodies (9) in which steel pipes (11) are inserted, and where a better stabilization is given by the come out sectors of the two pair of diffuser fins (2-3, 13-14) which come to contain the end part of the aluminium bodies (9). Radiator unit for heating plants, according to claim 1, characterized in that each central body (9) to be formed from an aluminium draw piece and with pressure insertion of a steel pipe (11) of the same length inside its channel (10). Radiator unit for heating plants, according to claim 1, characterized in that in an embodiment the radiator unit consists of an upper wrapping part (1) and a lower wrapping part (12) having three diffuser fins (2-3,13-14), three vertical channels (6) extending downwards with recessed portions (8, 16) at the ends of their walls (7,15).

Inventors: GRUPPIONI VALERIO, GRUPPIONI, VALERIO
Applicants: S I R A SPA, S.I.R.A. SPA
Application year: 1999
Main classification: F28D1
IPC codes: F28D1, F28F9, F24H3, F28F21