US2091593A - Radiator - Google Patents

Description

F, B. HERZ Aug. 31, 1937.

RADIATOR Filed Nov. 4

/N VEA T() A FERDINAND B-HERZ BY waxww 4 I ulm Patented Aug. 31, 1937 RADIATOR Ferdinand B. Herz, Detroit, Mich., assgnor Vto Borg-Warner Corporation, Chicago, Ill., a corporation of Illinois Application November 4, 1935, Serial No. 48,228

4 Claims.

The invention relates to heat exchange devices commonly termed radiators, such as used in connection with cooling systems for internal combustion engines. It is the object of the invention to obtain increased efliciency and to this end the invention consists of the construction as hereinafter set forth.

In the drawing:

Figure 1 is a horizontal section through a portion of a radiator of my improved construction;

Figure 2 is a perspective View thereof;

Figure 3 is an enlarged vertical se-ction on line 3-3 of Figure 1;

Figure 4 is an enlarged vertical transverse section;

Figures 5, 6 and '7 are views similar to Figure 1 showing modified constructions;

Figures 6A and 7A are cross-sections respectively on the lines. (iA-6A and lA-lA of Figures 6 and 7;

Figure 7B is a section on line IB- 1B of Figure 7.

Heat exchange devices of the type above referred to operate almost exclusively on the principle of air convection. For this, it is essential that the air which is to dissipate the heat should come in actual contact with the metallic surface through which the heat is conducted from the water tubes. It is usual to provide in addition to the tube surface, fins of thin metal through which the tubes pass and which are closely spaced to form therebetween air channels extending from front to rear. These ns have `been variously constructed to increase the amount of contact surface with the air and to change the direction of the current from a strictly rectilinear course with the object of increasing eiciency. It is, however, necessary to avoid any obstruction which will lessen the quantity of air passing through the radiator in a given time interval as this will have the effect of decreasing efficiency.

It is the object of the present invention to obtain a fin and tube construction which offers but slight resistance to the free flow of air through the radiator, but which produces a high degree of turbulence in the currents between the fins and tubes, the construction being as follows.

The tubes A are of a flattened elongated crosssection and are arranged in staggered or off-set rows. B are the fins which extend transversely and are apertured for the passage of the tubes therethrough. Each of these fins is formed with rounded embossments C, preferably a substantially spherical segment, and so arranged that each tube will extend diametrically acrossk one of these embossments. The metal struck out in forming the tube apertures constitutes a depending fia-nge D surrounding and closely fitting the tubes to increase the thermal Contact.

With the construction as just described it will' be evident that the superposed fins will extend in parallelism to each other and without restriction of the cross-section of the air currents passing therebetween, nevertheless, the air is caused to undulate both vertically and laterally thereby producing a churning action which brings all portions of the current at one time or another into actual contact with the metal surface. There is also a division of the air currents as they pass the successive tubes from front to rear. Thus, as shown in Figure 1, the air passing between the front tubes A' and A2 must rise over the embossments C and C2 with the exception of the portion which travels between these embossments. Upon reaching the tube A3 in the next row the current is divided a small portion indicated by the arrow E passing between the tubes A vand A3 and the rounded embossments thereof, while another portion indicated by the arrow F passes through the larger space between the embossments C2 and C3. This action is repeated in passing the successive rows of tubes. The spa-ce for the small current E forms in effect a Venturi passage being first restricted and then enlarged and with the result of increasing the velocity of the air passing therethrough. This high velocity current is commingled with the current passing on the opposite side of the tube A thereby causing further turbulence.

The modied constructions shown in` Figures 5 to 7 inclusive, all embody the features described in connection with Figures 1 to 4, but have some additional features. Thus in Figure 5, there is a further embossment G between the adjacent portions of the embossments C', C2. In Figure 6, the embossments C4 instead of being -circular are of greater length than width. There is also an embossment H arranged between the embossments C4 of adjacent tubes in the same row forming the cross-section shown in Figure 6A. In Figure 7, a continuous embossment I extends between adjacent tubes being of arcuate crosssection of diminishing radius from the tubes to the center therebetween, as shown in Figure 7B. With al1 of these modified constructions, an oscillatory movement will be imparted to the air during its passage through the radiator and there is also a dividing of the currents around each tube. Such structures have proven to be very eflicient in rapidly dissipating the heat and all can be easily manufactured at a low cost.

What I claim as my invention is:

1. In a radiator of the tube and fin type, a

5 plurality of rows of parallelly arranged tubes elongated in cross-section in the direction of air flow, and parallel ns extending transversely of said tubes provided with segmental spherical en bossments, each tube extending across the cen- 10 ter of the crest of an embossment, and the tubes and embossrnents in successive rows being olf-setA in relation to each other.

2. In a radiator of the tube and n typ`e,'ra'H plurality of rows of parallelly arranged tubes 15 elongated in cross-section in the direction '-of" air ow, and parallel ns extending transversely of said tubes provided with segmental spherical embossments registering with the respective tubes to be crossed diametrically thereby, the

20- tubes and embossments in successive rows being elongated in cross-section in the direction of air ilow, and parallel fins extending transversely of said tubes provided with segmental spherical embossments registering with the respective tubes to be diametrically crossed thereby and with additional embossments between the embossments of adjacent tubes in the saine row.

4. In a radiator of the tube and n type, a plurality of rows of parallelly arranged tubes elongated in cross-section in the direction of air ow, and parallel fins extending transversely of said tubes provided with segmental spherical embossments registering with the respective tubes so as to be diametrically crossed thereby, the tubes and embossments in successive rows being oiT-set'in relation to each other, and the tubes of said rows longitudinally overlapping whereby said tubes and embossments form a Y substantially Venturi-shaped restricted air passage therebetween with a larger air passage on the opposite side of the succeeding tube and with the Venturi passage of one tube in each row discharging into the larger passage of an adjacent tube in the same row.

FERDINAND B. HERZ.

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