AU610938B2

AU610938B2 - Plate-fin type radiator

Info

Publication number: AU610938B2
Application number: AU23706/88A
Authority: AU
Inventors: Eichi Ejiri
Original assignee: Sanyo Radiator Co Ltd
Current assignee: Sanyo Radiator Co Ltd
Priority date: 1987-10-21
Filing date: 1988-10-13
Publication date: 1991-05-30
Anticipated expiration: 2008-10-13
Also published as: AU2370688A; GB2211284B; KR890007046A; FR2622283B1; GB2211284A; FR2622283A1; CA1316529C; DE3835954A1; GB8824288D0

Description

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COMMONWEALTH OF AUSTRALIA PATENTS ACT 1952 Form COMPLETE SPECIFICATION FOR OFFICiJ 0, 38 Short Title: Int. Cl: 94.

'4 44I 4 4 4t 0# 4 Application Number: Lodged: Complete Specification-Lodged: Accepted: Lapsed: Published: Priority: Related Art: TO BE COMPLETED BY APPLICANT Name of Applicant: 0 Address of Applicant: Actual Inventor: Address for Service: SANYO RADIATOR CO., LTD.

9-13, Kuzuharashinmachi, Neyagawa-City, Osaka-Pref. JAPAN Eichi Ejiri GRIFFITH HACK CO.

71 YORK STREET SYDNEY NSW 2000

AUSTRALIA

Complete Specification for the invention entitled: PLATE-FIN TYPE RADIATOR The following statement is a full description of this invention, including the best method of performing it known to me/us:- 1139A:rk t- C I 0 0 0 00 a The present invention relates to a plate-fin type radiator.

As shown in Figs, 14, 15 in a prior arit plate-fin type radiator (core section), a number of radiating plates 101 are arranged with prescribed spacings therebetween and provided with a plurality of flat tubes 102 penetrating therethrough. In the figures, only one flat tube 102 is shown. At the portion of the flat tube 102 penetrating the radiating plate 101, a flange 103, formed by burst processing, is placed in contact with a peripheral surface of the flat tube 1.02 and soldered to secure the joint.

in the conventional burst forming of the flange 103, the flange can not be formed completely vertically with respect to the horizontal radiating plate 101, Therefore, the soldering of the radiating plate 101 and flat tube 102 is of poor quality due to incomplete contact between the flange 103 and the peripheral surface of the flat tube 1.02, resulting in an insufficient radiating effect. in addition, since the flange 103 is formed by burst processing, it rises 20 high and moreover, it is susceptible to adhesion of dust and the like because of its rough and notched edges.

According to a first aspect of the present inveaition there is provided a plate-fin type radiator including a plurality of spaced-apart radiating plates arranged at prescribed distances from each other, and a number of flat tubes penetrating through said radiating plates, wherein a 'a vertical flange is formed in the radiating plates at each of the locations penetrated by the flat tubes, as follows: a hole is bored by blanking, the hole being smaller a30 than the cross-section of the flat tubes to provide material 4 for the flange, thereafter the edges of the hole around the entire periphery are formed into a vertical flange, using 0 said material and enlarging the hole to the cross-section of a the flat tubes; the inner surface of the flange being subsequently attached to the external surface of the flat tube.

According to a second aspect of the present invention there is provided a plate-fin type radiator including a 41 1 plurality of spaced-apart radiating plates arranged at Sprescribed distances from each other, and a number of flat 00 0 0 00 a 04 0 as 00 R A

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6569 S/EM -2- Po08t0o11 *I I f Vot~ GRIFFI HACK CO SYDNEY OFFICE MELBOURNE OFFICE OS P.O. BOX 4164 GTP. BOX 1285K SYDNEY, N.S.W, 2001 MELBOURNE, VIC 3004 tubes penetrating through said radiating plates, wherein a vertical flange is formed in the radiating plat-es at each of the locations penetrated by th., flat tubes, as follows: a cap shape is drawn, having continuous peripheral side-walls and a continucus bottom, the bottom having the same cross-section as the flat tubes, a hole is then bored by blanking in t.he bottom leaving the peripheral side walls to form the vertical flange; the inner surface of the flange being subsequently attached to the external ourface of the flat tube.

According to a third aspect of the present invention there is provided a plate-fin type radiator including a plurality of spaced-apart radiating plates arranged at prescribed distances from each other, and a number of flat tubes penetrating through said radiating plates, wherein a vertical flange is formed in the radiating plates at each of 00 the locations penetrated by the flat tubes, as follows: 0 00 0a cap shape is drawn, having continuous peripheral side 010 0 o00 walls and shaped with a continuous bottom, the bottom having 009020 the same cross-section as the flat tubes, a hole is then 00 bored by blanking in the bottom leaving the side-walls to 000 o0 form part of the vertical flange, the hole being smaller than the cross-section of the flat tubes to provide extra 0 4 0 material for the vertical flange, thereafter the edges of the hole around the entire periphery are formed into an extension of the vertical flange, using the extra material and enlarging the hole to the cross-section of the flat tubes; a 44 C 0 the inner surface of the flange being subsequently 30 attached to the external surface of the flat tube.

0 Therefore, embodiments of the present invention are devised to facilitate a sufficient contact between the 0064, peripheral surface of a flat tube and a flange of a radiating plate to ensure adhesion by soldering, thereby 4 5 improving the radiating effect, and to form a vertical, flange at the portion where the flat tube penetrates the radiating plate by burring, drawing-blanking and other processing for sufficient contact therebetween to ensure adhesion by soldering such that adhesion of dust and the T like are minimised.

9 S/EM since the vertical flange is formed in the radiating plate by burring drawing-blanking or other pocessings, and said flange is placed in contact with a peripheral surface of the flat tube, a good contact can be achieved for sufficient adhesions by soldering, Notwithstanding any other forms that may fall within its scope, a preferred form of the invention will now be described, by way of example only, with reference to the accompanying drawings in which: Fig. 1 is a side view of one specific embodiment of the present invention, Fig. 2 is a front view of Fig. 1,.

Fig. 3 is an explanatory plan view '3f burring of a radiating plate, Fig. 4 is a plan view of a radiating plate processed by drawing, Fig. 5 is a sectional view taken along the line V-V of 09 00 0 00 0 o0 0 0~ 04 0 00 00 0 0 25 0 a A a00 0b 00t 0A A ku N j 0 356 Fig 4, Fig. 6 is a plan view of the radiating plate processed by blanking, Fig. 7 is a sectional view taken along the line VII-ViI of Fig. 6, Fig. 8 is a plan view of the radiating plate processed shallowly by drawing, Fig. 9 is a sectional view taken along the line IX-IX of Fig. 8, Fig. 10 is a plan view of the radiating plate whose inner hole 24 set in anticipation of the height of flange 23 rising vertically from the wall formed by drawing is blanked, Fig. 11 is a sectional view taken along the line XI-XI of Fig. Fig. 12, is a plan view of the radiating plate in which the flange 23 is formed by flanging up portions bent inwardly from the wall to form extensions thereof, Fig. 13 is a sectional view taken along the line XIII-XIII of Fig. 12, Fig. 14 is a side view of a conventional plate-fin type radiator, and Fig. 15 is a front view of Fig. 14.

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I- U t As shown in Figs, 2. and 2, a plate-fin type radiator comprises a number of radiating plates 2I made of a thin metal sheet and arranged with prescribed spacings and a plurality of flat metal tubes 2 penetrating through the radiating plates 1.

Each radiating plate 1 includes a flange 3, formed by burring, which in contact with a peripheral surface of the flat tube 2 and fixed thereto by soldering.

Example thickness of a radiating plate I 0,1mm flat tube 2 2.8mm x 14.2mm spacing between radiating plates 1 height of a flange 3 0.5 0,7mm As shown in Fig. 3, in the radiating plate 1, first an inner hole 4 which is set in anticipation of the height of flange 3 rising vertically from the outer circumference of the flat tube 2 to be penetrated is bored by blanking.

Thereafter, as shown in Fig. 1 and Fig. 2, pheripheral edges of the hole 4 are risen vertically throughout the entire 000010( circumference from two-dot chain lines A as the base end to a form the flange 3 with a constant height (burring).

0-0 00The flange 3 thus formed by burring is lower and formed vertically throughout its height when compared with the Go 4 0 44 prior art flange 3 formed by bursting.

Although flange 3 is described as continuously formed throughout the entire circumference, it is not limited thereto and those which are formed disconnectedly are also included. The essential requirement is that the flange 3 is 04 formed vertically. When the flange 3 is formed, contour t0 lines of the blanking may be partly entered inward or the flange 3 may be notched partly after being flanged up by burring.

The forming of flange 3 is not limited only to the 0 *Aft burring, but the drawing-blanking or other processings may 4 4 1.~35 be used. As shown in Fig. 4 and Fig. 5, in the drawing-blanking, first a thin metal sheet is drawn into a cap shape with a bottom having a wall which is continuous throughout the entire circumference for contacting the surface of the flat tube 2 and becoming the flange, and into V which the flat tube 2 is to be inserted.

69 Portions intended for the flange 13 are formed by drawing.

Thereafter, as shown in Fig. 6 and Fig. 7, the bottom formed by drawing is blanked to allow the flat tube 2 to penetrate through the radiating plate 1, thereby the flange 13 is formed throughout the entire circumference as shown in Fig.

7. When the portions intended for flange 13 are formed from the thin metal sheet by drawing in such a manner, the vertical wall can be formed reliably and precisely, thus the flange 13 can be formed from the wall without springing back even afte the blanking. As shown in Fig. 8 and Fig. 9, the thin metal sheet is drawn shallower than the height of the flange 23. Next, as shown in Fig. 10 and Fig. 11, an inner hole 24 set in anticipation of the height of flange 23 rising vertically from the wall formed by drawing is bored by blanking. Then, as shown in Fig. 12 and Fig. 13, the 04\4\' portion bending inwardly from the wall are flanged up to 0°o become extensions of the wall to form the flange 23. The "0 1 t os o flange 23 thus formed has the base end formed by drawing, )0 4 o thus it is formed reliably and precisely. In either case, 0 ~"20 the flange 3 is not necessarily continuous throughout the entire circumference, it may also be sometimes 0 O0 discontinuous. The essential requirement is that the flange O o 0 00 o1.4o 13 is formed vertically to the radiating plate 1.

0 0 Though the flange 3, 13 is described here as ,r0 025 vertical, it will be appreciated that those having their Ot 0 tips slanting inwardly at an angle which is not exactly 00.000 but slightly different therefrom due to the springing back -o000 on processing are included, as far as said flange 3, 13 is o in sufficient contact with the peripheral surface of the flat tube 2 for good adhesion by soldering for having good radiating effect.

The flat tube 2, onto which solder to a depth of about 20im is applied to its surface, at least in the region to which the flange is to be attached, is penetrated through the penetrating portion of the radiating plate 1 and heated at 3404/350 0 C for about 3 minutes for adhesion.

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L S 6569S:JM 1 i' As described hereinabove, in the present invention, since the vertical flange, formed in the portion of the radiating plate penetrated by the flat tube, is in direct contact and fixed to the peripheral surface of the flat tube, both of them are contacted sufficiently to facilitate adhesions by soldering, thereby improving the radiating effect. Moreover, since the tips of the flange are sheared sharply when compared to the prior art flange which is formed by bursting and is rough and notched, adhesion of dusts and the like can be prevented or at least greatly reduced and/or easily removed.

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Claims

3. A plate-fin type radiator including a plurality of spaced-apart radiating plates arranged at prescribed distances from each other, and a number of flat tubes penetrating through said radiating plates, wherein a vertical flange is formed in the radiating plates at each of the locations penetrated by the flat tubes, as follows: LS6 M 6569S/EM -8- i i 1 a cap shape is drawn, having continuous peripheral side walls and shaped with a continuous bottom, the bottom having the same cross-section as the flat tubes, a hole is then bored by blanking in the bottom leaving the side-walls to form part of the vertical flange, the hole being smaller than the cross-section of the flat tubes to provide extra material for the vertical flange, thereafter the edges of the hole around the entire periphery are formed into an extension of the vertical flange, using the extra material and enlarging the hole to the cross-section of the flat tubes; the inner surface of the flange being subsequently attached to the external surface of the flat tube,
4. A plate-fin type radiator substantially as herein described with reference to the accompanying g drawings. 0 °o DATED this 7th day of February 1991 0 0 20 SANYO RADIATOR CO., LTD. a By their Patent Attorneys 0 0 GRIFFITH HACK CO. 0 0 0 0 000 o 0 0)0 06 0 0 0 0 00 0 o a 0 a 0 0 0 0 o o 0 000 0 0 0 3 0 00 00 4 0 oo 030 0 0 0 0 0 00 '3 0 0 0 0**35 6569S/EM -9-