Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F1/00—Tubular elements; Assemblies of tubular elements
  • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
  • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
  • F28F1/14—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D53/00—Making other particular articles
  • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
  • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F28—HEAT EXCHANGE IN GENERAL
  • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
  • F28F2275/00—Fastening; Joining
  • F28F2275/12—Fastening; Joining by methods involving deformation of the elements

Definitions

• the subject of the present invention is a method for carrying out heat exchangers through a clamping obtained by mechanical deformation of an hydraulic or pneumatic circuit in a pre-arranged seat in a given solid body.
• the invention describes a novel method for the application of a hydraulic or pneumatic circuit (obtained by circulating a liquid or gaseous substance within one or more pipes) to a solid body for the purpose of transmitting and/or receiving from the same a thermal influence by contact. It is known, in fact, that the physical contact amongst materials with different temperatures generates in both a mutual influence on the respective temperature. For the purpose of obtaining a physical contact between a moving liquid or gaseous material and a solid body, it is necessary to restrain the liquid or gaseous material within a forced conduit.
• Said forced conduit takes or gives thermal energy from the liquid and/or gaseous element, which passes through it, and in turn it takes and/or gives thermal energy from the surrounding in which it is contained; therefore, by maintaining in a physical contact the forced conduit with a solid body, said conduit becomes the means of the heat exchange between the liquid or gaseous material contained therein and the solid body contacting therewith.
• the process of the art known for stably associating a forced conduit to a solid body consist of welding/brazing, bonding (for example with thermic cement) methods, or mounting/fixing through the use of screws or rivets.
• the method subject of this patent is aimed to obtain an optimization in technical/economical terms of the fixing of said forced conduit to a given solid body, by obtaining a simplification of the assembly process.
• the present invention relates to a method for clamping a forced conduit to a solid body for the purpose of obtaining a heat exchange between a solid element and a liquid or gaseous substance.
• Said irreversible fixing step includes a mechanical deformation process of the used materials.
• the process includes the step of constituting on a solid body an anchorage seat for the positioning and the clamping by mechanical deformation of a forced conduit.
• the method includes the step of positioning a forced conduit in a pre-arranged seat on a surface of a solid body.
• the method of the present invention includes the step of exerting a sufficient force to modify the morphological features of the used elements, so as to obtain amongst the same a mechanical clamping sufficient for maintaining into contact the surfaces of said elements, causing a mutual thermal influence.
• the method is characterized in that, following to one or more mechanical actions, the forced conduit remains restrained within the housing seat so as to be into contact with the solid.
• the result obtained by the method is that the section of the forced conduit (B in Fig. 1) has greater dimensions than those of the housing seat (A in Fig. 1).
• the method is characterized in that the object of mechanical deformation is the shape of the section of the forced conduit (fig. 3A and 3B).
• the method is characterized in that the object of the mechanical deformation is the shape of the section of the housing seat of the forced conduit (fig. 4A and 4B).
• the object of the mechanical deformation are the longitudinal edges of the seat.
• the section of the seat subjected to mechanical deformation is merely defined by said solid body, in particular said edges are an integral part of the solid body.
• the method is characterized in that the object of the mechanical deformation is both the shape of the section of the housing seat of the forced conduit, and the shape of the section of the forced conduit (fig. 5A and 5B).
• FIG. 1 shows, in a cross-section of the seat and the conduit, a preferred embodiment of the heat exchanger according to the present invention
• - figure 2 shows, in a cross-section, the seat according to an example of the present invention
• - figures 3A and 3B shown, in a cross section, two subsequent steps of an embodiment example of the method according to the present invention
• FIG. 4A and 4B show, in a cross-section, two subsequent steps of a further embodiment example of the method according to the present invention
• FIG. 5A and 5B show, in a cross section, two subsequent steps of a still further embodiment example of the method according to the present invention
• FIG. 6 shows, in a cross section, a step of a still further embodiment example of the method according to the present invention
• - figure 7 shows, in a cross section, a step of a still further embodiment example of the method according to the present invention
• - figures 8 and 9 show, in a cross section, two embodiment variations of the seat according to the present invention
• FIG. 10 shows, in a cross section, a step of a still further embodiment example of the method according to the present invention.
• Figure 1 represents, in summary but not binding terms, the result obtained through the application of the present invention. From said image it is pointed out how the seat 3 existing on the solid body 1 and in which the forced conduit 2 has been inserted, following to a mechanical deformation, shows a smaller section A with respect to the section of the conduit B itself, giving rise, from one side, to an irreversible clamp- ing and from the other side obtaining a direct contact, in terms of heat interchange, between the conduit and the solid body containing the same.
• the section A is the width (shown by a two- pointed arrow in figure 1) of the inlet mouth of the seat 3, taken on the cross section. It has to be noted that the seat has a longitudinal development (normal to the plane of the figure), being suitable for receiving the conduit which notoriously has a longitudinal development.
• the section B is the maxi- mum width on the cross section (shown by a second two-pointed arrow in figure 1) of the conduit. Due to the physical contact between the internal wall of the seat and the external wall of the conduit, according to the present invention, such section B corresponds with the maximum cross width of the seat.
• the present invention consists of a method for keeping into contact the forced conduit and one or more solids for the purpose of obtaining and therefore carrying out a heat exchange between them.
• Said invention presents a further purpose, namely to fix the circuit of the forced conduit within the seat in which it has been inserted by restraining the same within a housing which maintains it in a determined position.
• a housing which maintains it in a determined position.
• the mechanical deformation foreseen as above shown for the fixing of the conduit to the solid body, can involve both the conduit itself (fig. 3A and 3B) and the housing seat (fig. 4A-4B) or both (fig. 5A-5B).
• the deformation involves the conduit, it must necessarily be consti- tuted by a mechanically anelastic material, such that the mechanical deformation imparted thereto permanently remains, as shown in the figures 3B and 5B.
• Figures 2, 6, 7, 8, 9 and 10 represent some possible non binding examples of sections of housing seats for positioning the forced conduit and clamping the same therein.
• Fig. 2 represents an elliptical section for clamping a forced conduit, said clamping is obtained by directly acting on the conduit itself through a pressure action.
• the dimension of the conduit along the direction of the seat depth namely the cross dimension perpendicular to the solid surface
• the width A of the mouth of the seat is equal to about 8 mm
• the diameter of the circular section of the conduit is equal (subject to a slight tolerance for allowing the insertion) to the width A of the mouth
• the maximum width B of the chamber of the seat is equal to about 9 mm
• the depth of the seat is equal to about 5.5 mm.
• Fig. 6 represents a circular-shaped section, wherein the clamping is obtained through a pressure action di- rectly applied on the conduit, which will have an elliptical shape, as shown by way of example in figure 6.
• the conduit could have a circular section, with, for example, the width A of the mouth of the seat equal to 8 mm, the diameter of the circular section of the conduit equal to the width A of the mouth, the maximum width B of the chamber of the seat equal to 8.5 mm and the depth of the seat equal to 6.5 mm.
• Fig. 7 represents a seat with a substantially rectangular (as shown in figure) or squared section with bulged side walls, thought for the clamping through a pressure directly applied on the conduit, which in this case will have a substantially squared or rectangular-shaped section (as shown in figure).
• Fig. 8 shows an alternative housing section to those shown in figure 4A and 5A for the clamping of a forced conduit obtained through the mechanical deformation of two opposite lips existing on the two longitudinal edges of the mouth of the seat.
• Fig. 9 represents an asymmetric section for the clamping of a forced conduit obtained through the mechanical deformation of a single lip existing on the mouth of the seat.
• Fig. 10 represents a section of the seat in which the width of the mouth is substantially equal to the maximum width of the seat. In other words, the seat shows at its entrance a well with parallel walls with knurled sides 10.
• the conduit can have a circular or preferably, as shown in figure 10, elliptical section.
• the clamping is obtained directly acting on the conduit itself by applying a pressure. In this case, it is important that following to the aforesaid pressure action, the conduit comes into a forced contact with the knurled sides 10, so as to remain clamped by friction on said knurlings.
• the conduit must have such shape and dimensions that, once inserted in the seat and before the pressure, it contemporaneously hits the bottom of the seat and protrudes from the surface of the solid body. In other words, the dimension along the depth direction of the seat must be greater of the depth itself of the seat.
• the conduit is bulged within the seat so as to define a forced contact on the two opposite and knurled walls 10 of the seat 3.
• forced contact one means that, after the mechanical deformation of the conduit is occurred, the conduit itself exerts a pressure on the two side and opposite walls of the seat.
• knurlings can be arranged along all the depth of the side walls.
• knurlings can be applied to all the embodiment examples described in this application; for the pu ⁇ ose of rendering stronger the anchorage of the conduit to the seat.
• the anchorage between the conduit and the seat is obtained thanks to at least one between two factors, one factor bound to the geometrical forms of the seat and the conduit, as shown in figure 1 , 3B, 4B and 5B, and one factor bound to the pressure that the deformed conduit exerts on the internal walls of the seat, particularly on the two side and opposite walls.
• This second factor can synergically co-operate with the knurlings above described.
• the anchorage is obtained thanks to both factors.
• the conduit can be made of copper.
• the solid body can be made, for example, of iron or preferably aluminium or an aluminium alloy.
• the dimension of the conduit along the depth direction of the seat can also be lower than the depth of the seat itself.
• the conformation of the seat presents at the entrance a well with parallel walls until a determined depth, to which a chamber is extended, for example with an elliptical, circular or substantially rectangular section, having a maximum width greater than the entrance width.
• the conduit can be an electrical resistance suitable for being crossed by electric current and thus producing heating by Joule effect.
• the conduit is deformed, it is necessary that such resistance is anelastically deformable, for example thanks to a hollow ring-section, such as those shown in the figures.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Geometry (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

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Cited By (1)

Citations (5)

• 2007
  • 2007-03-02 IT ITBS20070013 patent/ITBS20070013U1/it unknown
  • 2007-06-22 WO PCT/IB2007/052431 patent/WO2008107743A1/en active Application Filing

Patent Citations (5)

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