SK6199A3 - Radiator, in particular for heating systems, with a high resistance to internal pressure - Google Patents

Abstract

A radiator (1) having at least one module (2) including: a tubular portion (3) with a flat cross section (4); opposite top and bottom ends (7,8) having respective lateral hydraulic fittings (10) substantially aligned along a minor axis of the cross section; and a finned portion (5) formed integrally in one piece with a lateral wall (13) of the tubular portion (3); the finned portion including first fins (11) originating directly from the tubular portion, and second fins (12) originating transversely from respective front ribs (13) in turn originating from the tubular portion (3) and perpendicular to the first fins (11); the ribs being substantially aligned with a major axis of the cross section; the cross section (4) having a dimension (D), measured along the major axis, smaller than or equal to 45% of the depth (P) of the module (2), also measured along the major axis, and a wall thickness (S) ranging between 2.4 and 4.5mm; and a root portion (20) of each rib (13) having no fins, and having a number of respective ridges (22) connecting the root portion (20) to the lateral wall (6) of the tubular portion (3) and to a second fin immediately adjacent to the tubular portion. <IMAGE>

Description

RADIATOR, SPECIFICLY FOR HEATING SYSTEMS, HIGH RESISTANCE TO INTERNAL PRESSURE

Technical field

The present invention relates to a radiator, in particular a light alloy radiator, suitable for installation in civil and industrial heating systems and having a configuration having a high resistance to internal pressure.

BACKGROUND OF THE INVENTION

As is known, radiators with a modern heating system may comprise a number of standard modules, stacked tightly in liquid-impermeable enclosures, and connected to a piping system. These modules may be formed of a light alloy and comprise a tubular portion through which the thermal fluid flows and a finned portion which is integral with the tubular portion and which takes away the heat supplied by the heat exchange of the liquid and shares this heat with the convection and radiation.

In order to allow a firm, tight connection of the modules, the tubular part usually has a flat cross-section, as shown in FIG. 1, which is usually fixed over the entire length (height) of the tubular portion and which is in the form of a rectangular or rectangular trapezoid or a trapezoid of the double-isosceles triangle with rounded edges and maximum transverse dimensions measured parallel to two vertical symmetry axes; X (major axis, i.e. parallel to a larger dimension) and Y (small axis). Two ribs extend from the end edges of the rhombus at opposite ends of the main axis X, of which several transverse ribs extend, and the other ribs extend directly from the side wall of the tubular portion, especially from the same end edges as the two ribs.

Radiators containing known modules of the aforementioned type have low internal pressure resistance. In particular in the pressure test, known radiators are destroyed at 14-24 bar pressure, while radiators capable of withstanding higher pressures usually have a thicker side wall of the tubular portion, which increases both their weight and cost.

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SUMMARY OF THE INVENTION

It is an object of the present invention to provide a cheap and lightweight radiator for civil heating systems which can be cast from a light alloy and which provides both a higher number of bars for both efficient heat exchange and burst resistance than known radiators, e.g. over 30 bars.

According to the present invention there is provided a radiator comprising at least one module in a bend comprising a tubular section having a cross-sectional area; the opposite upper and lower ends having respective lateral hydraulic devices aligned along a small axis of the cross-section; and a rib portion that is integral with the side wall of the tubular portion; the ribbed portion includes first ribs extending directly from the tubular portion and a second ribs extending transversely of the respective front ribs extending from the tubular portion and perpendicular to the first ribs, the ribs aligned with the major axis of the cross-section, the module being characterized in that wherein the cross-section has a magnitude measured along the major axis equal to or less than about 45% of the depth of the module, also measured along the major axis.

In addition, the starting orifice of each rib is free of ribs, and includes a plurality of protrusions connecting the rib both to the side wall of the tubular portion and to the respective second rib carried by the front rib and adjacent to the tubular portion.

The geometry, determined by the above parameters, makes it possible to achieve radiators capable of withstanding internal pressures above 35-40 bar, while being able to maintain a relatively thin wall of the tubular part (from 2.4 mm to 4.5 mm), as well as low weight, low cost, and further capable of maintaining the overall dimensions of the module perfectly compatible with commonly used heating systems (module depth over 80 mm; any module height measured along the axis of the tubular portion; and high density, compressed in confined space).

These unexpected, advantageous properties, ascertained experimentally, are attributed to the favorable pressure distribution achieved by the geometry of the present invention, which, given the appropriate combination of dimensional and shape parameters, allows the tubular portion to better distribute the internal pressure stresses while allowing the ribs to contribute actively partial stress and thus improve the mechanical resistance of the tubular part.

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Brief overview of the drawings

A non-limiting embodiment of the invention will now be described by way of example and with reference to the accompanying drawings:

Figure 1 shows a cross-section of a known radiator module (with a rectangular water chamber).

Fig. 2 shows, not to scale, different cross-sections at different heights of a radiator module in accordance with the present invention.

Fig. 3 shows three views of the radiator module of FIG. longitudinal section (fig. 3a), rear view (fig. 3b) and side view (fig. 3c).

DETAILED DESCRIPTION OF THE INVENTION

The number 1 in Figures 2 and 3 indicates the entire radiator for civil and industrial heating systems, and for simplicity, only one module 2 is shown. As is known, the radiator 1 may comprise any number of modules 2 connected closely together and mutually connected impermeable.

For this purpose, each module 2 comprises a tubular portion 3 having a vertical longitudinal axis and a flat radial cross-section 4; and a ribbed portion 5 integral with the side wall 6 of the tubular portion 3. The cross-section 4 is planar in that it comprises substantially different transverse dimensions, measured in parallel with the two vertical axes of symmetry, designated X and Y. as the Y-axis size, the X-axis is hereinafter referred to as the major axis, and the Y-axis as the small axis.

The opposite upper and lower longitudinal ends 7, 8 of the tubular portion 3 are provided with a respective cylindrical hydraulic device 10 aligned along the small Y-axis of the corresponding cross-section 4, i.e. with the respective symmetry axes coaxial to the Y-axis in cross-section 4. the height of the device 10, i.e. in the same longitudinal position (with respect to the symmetry axis of part 3) as the device 10.

Each module is preferably made of a light alloy or the like by a plastic injection method, and for this purpose the lower end 8 is opened and closed in a known manner by a plug 8a in a known manner.

The rib portion 5 comprises a first number of ribs 11 extending directly from the tubular portion 3; and a second number of ribs 12 extending transversely of the respective front ribs 13, which, in each case, are provided with a plurality of ribs

12136 bends extend from the tubular portion 3 and are perpendicular to the ribs 11. The ribs 13 are aligned with the major axis X of the entire cross-section 4 of the tubular portion 3.

According to a first characteristic of the invention, each transverse cross-section 4 of the tubular part 3 has an internal size D, measured along the major axis X, equal to or less than about 45% of the depth P of the module 2 also measured parallel to the X axis of the corresponding cross-section 4 (FIG. 2). This means that for each cross-section 4 the following inequality applies:

(1) D <0.45 P

Equation (1) refers in particular to the cross-section 4 in the plane CC (FIG. 2), i.e. the cross-section 4 corresponding to the lower end (i.e., the closest device 10 of the end 8) of the rib portion 15 of the tubular portion 3 part of part 3, provided with ribs 11.

Equation (1) also applies to the remainder of the fin part 15, except that the injection molded modules 2 (value D), as known to those skilled in the art, must be further reduced by the amount pertaining to the designated angle.

Depending on the overall dimensions of the module 2 (the total length or also the height of the tubular part 3, which may be of any length; and the depth P, which must be over 80 mm), the thickness S of the side wall 6 of the tubular part 3b preferably ranges from approximately 2.4 mm to 4.5 mm. These values are derived from the average thickness S, calculated as the arithmetic mean of the two wall 6 thicknesses, measured at opposite points of the respective cross-section 4.

According to a preferred feature of the invention, each transverse section 4 of the tubular portion 3 has a size L measured along a small Y axis that is equal to or greater than about 15% of the size D of the same cross-section 4 measured along the major X axis.

(2) L <0.15D

Equation (2) refers in particular to the cross-section 4 in the plane C-C (Fig. 2).

According to a third characteristic of the invention, each rib 13 has a starting orifice 20 without ribs 12, and extends from a corresponding portion without ribs 11 of the side wall 6 of the tubular portion 3, the portion 20 of each front rib 13 comprises several respective protrusions 22 over the length of the ribbed portion 15; and the protrusions 22 are formed to connect each rib 13 to both the side wall portion 6 of the tubular portion 3 from which the starting orifice 20 extends and the rib 12 that is closest to the starting orifice 20, i.e. adjacent to the tubular portion third

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Finally, as clearly shown in FIG. 2, the sizes D and L, measured along the major and small axes X and Y of each cross-section 4, may vary along the entire axial extent of the tubular portion 3, provided, of course, that equations (1) and (2) are consistent.

Thus, at least along the entire rib portion 15, the cross-section 4 of the tubular portion 3 may be shaped as shown in planes A-A and B-B in FIG. 2, it is in the form of a rectangular circle with rounded corners and with imperceptibly outwardly curved sides. Conversely, in the C-C plane, it may take the form of a diamond shape, but with different size ratios between the major and small X and Y axes, in accordance with Equations (1) and (2).

The invention will now be further described by way of example.

EXAMPLE

In order to determine the true difference in performance between the radiator described and a conventional radiator, six different radiators, each containing two closely adjacent modules, were tested.

Three known radiators, two of which were manufactured by the present applicant and one purchased, had a cross-section as shown in FIG. 1, a depth P over 80 mm, an internal size D of a water chamber (tube in which the heat exchange fluid flows) equal to or greater than 0.50 P, i. 50% P (particularly cross-section 4 in the plane C-C in Fig. 2).

The three radiators and three others of the present invention were sequentially tested by being connected to a test circuit equipped with a variable head pump. Once connected, the water pressure inside each radiator gradually increased from 3 bar at a rate of one bar per minute until the radiator burst. Pressure values were continuously monitored using a recording pressure gauge, and the results are shown in Table 1.

Table 1

BACKGROUND OF THE INVENTION

RADIATOR 12 3 4

CRITICAL PRESSURE 14b 15b 21b 35b

INVENTION

6

40b 38b

Claims (8)

PATENT CLAIMS A radiator comprising at least one module, in a bend comprising a tubular portion (3) with a flat cross-section (4); the opposite upper and lower ends (7, 8) having respective lateral hydraulic devices (10) aligned along a small axis (Y) of the cross-section (4); and a rib portion (15) that is integral with the side wall (6) of the tubular portion (3); the rib portion (15) includes first ribs (11) extending directly from the tubular portion (3) and second ribs (12) extending transversely of respective front ribs (13) in bend that extend from the tubular portion (3) and are perpendicular to the first ribs (11); the ribs are aligned with the major axis of the cross-section (X); A module characterized in that the cross-section (4) has a size (D) measured along the major axis (X) equal to or less than about 45% of the module depth (P), also measured along the major axis (X). A radiator according to claim 1, characterized in that the starting orifice (20) of each rib (13) is free of ribs (12) and comprises a plurality of respective protrusions (22) connecting the rib as to the side wall (6) of the tubular portion (13). 3), and with the respective rib (12) supported by the front rib (13) and adjacent to the tubular part (3). A radiator according to claim 1 or 2, characterized in that said cross-section (4) of the tubular part (3) has a wall thickness (S) ranging from about 2.4 to about 4.5 mm. A radiator according to any one of the preceding claims, characterized in that said cross-section (4) of the tubular part (3) has a size (L) measured along a small axis (Y) equal to or greater than about 15% of the size (D). ) of the same cross-section (4), measured along the main axis (X). A radiator according to any one of the preceding claims, characterized in that the sizes (D) and (L) measured along the main axis (X) and the small (Y) of each cross-section (4) can vary along the axial extent of the tubular part (3). ) or may remain constant along the entire axial extent of the tubular portion (3). 12136 A radiator according to any one of the preceding claims, characterized in that said at least along the axial portion of the tubular portion has said first ribs (11), said cross-section (4) of the tubular portion (3) being rectangular in rounded corners and noticeable von curved sides. A radiator according to any one of the preceding claims, characterized in that the depth (P) of the module, measured along the main axis (X) of the cross-section (4) of the tubular part (3), is over 80 mm. 8. A radiator, particularly for heating systems, having a high resistance to internal pressure as described and illustrated in the accompanying drawings.