US788771A - Surface-cooler. - Google Patents

Description

No. 788,771. PATENTED MAYZ, 1905. W. HOHBACH.

SURFACE COOLER.

APPLICATION FILED OUT. 31,1904.

NTTED STATES 12cm peauea'ea 2, 19u5.

PATENT OFFICE.

WILHELM HOHBAOH, OF ULM, GERMANY, ASSIGNOR TO THE FIRM OF NEUE GASINDUSTRIE, ULM, G. M. B. H., OF ULM, GERMANY.

SURFACE-COOLER.

SPECIFICATION forming part of Letters Patent No. 788,771, dated May 2, 1905.

Application filed October 31, 1904. Serial No. 230,789.

V at Ulm-on-the-Danube, Kingdom of Wiirtexrr berg, in the Empire of Germany, have invented a new and useful Surface-Cooler, of which the following is a specification.

My invention relates to improvements in surface-coolers, either for stationary plants or for vehicles or the like such as, for instance, automobiles and autotrucks-of that kind in which between a reservoir for warm liquid and a reservoir for cooled liquid a series of cooling-plates in pairs is inserted and so arranged as to form a plurality of narrow passages for the liquid to be cooled by the contact of the external plate-surfaces with a stream of air.

, The objects of my improvement are, first, to provide the two plates of each pair with a plurality of cross channels and projections of triangular cross-section which alternate on each plate and correspond to those of the other plate, so that a narrow zigzag channel in the longitudinal direction is formed between the two plates; second, to provide the two plates of each pair with a plurality of bosses between'the cross channels and projections, which bosses on either plate rest on plain parts of the other plate and serve as distancepieces; third, to provide the two plates of each pair with a longitudinal projection along either edge, which projection rests on the other plate and serves as a distance-piece, and, fourth, to close the edge spaces between the two plates of each pair by means of solder.

The surface-coolers according to my invention present several advantages: First, they can be produced quickly and cheaply; second, they can be so arranged as to form a plurality of comparatively narrow cross-channels through which the air can be passed or sucked or forced in order to take up as much heat as possible from the liquid, and thus to cool the latter most efiectively, and, third, a comparatively small quantity of liquid will do for the respective purpose, since it can be constantly cooled.

I will now proceed to describe my invention with reference to the accompanying drawings, in which Figure 1 is a vertical cross-section on the line C 1) in Fig. 2 through a cooler, a part of the upper reservoir for the warm liquid and a part of the lower reservoir for the cooled liquid, the second element (counting from left) of the cooler proper being alone filled with liquid. Fig. 2 is a longitudinal section through the line E F in Fig. 1, and Fig. 3 is a horizontal section through the line A B in Figs. 1 and 2.

Similar letters of reference refer to similar parts throughout the several views.

As is clearly shown in the drawings, each plate a of sheet metal is so pressed or stamped in suitable machine-tools as to receive on the one face a plurality of parallel cross channels ff and projections r g, alternating one with the other, a plurality of bosses b I) in the plain parts between the channels ff and pro jections g g, and on the other face a longitudinal channel 0 along the one edge. The cross channelsf'fand projections g r are preferably made triangular in cross-section. Each channel f on the one face of the plate (0 appears as a projection on the other face, and each projection g on the former face appears as a channel f on the latter face. Two plates (1 a are so placed on each other that the projections g g of the one plate a engage in the channels ff of the other plate a, and vice versa, and that the projection forming the other face of the channel a of the one plate a,

bears on that edge of the other plate a which is left without a channel r;-that is to say, the channel 0 of the one plate a is on the left and that of the other plate a is on the right. (See Figs. 2 and 3.) Thereby a narrow zigzag channel of a nearly uniform thickness is formed between the two plates (.0 a in their longitudinal direction. The bosses Z) Z) of either plate a bear on plain parts of the other plate a and serve as distance-pieces. Each plate is sulficiently stiffened in the cross direction by the cross projections g g on both faces and will therefore not bend under the action of the head of the liquid. For connecting the two plates at a the two edge spaces 2 2 (see Fig. 3) are preferably filled up with solder, whereby also the passage k is closed on both sides. Thus an element of the surface-cooler is produced. Several elements so formed are connected at their ends to a reservoir (Z for warm liquid and to a reservoir 0 for cooled liquid in any known and approved manner. For example, the respective plates 7c and Z of the two reservoirs may be provided with several parallel lengthy openings into which the ends of the cooler parts are introduced and in which they are secured by soldering. Preferably the several cooler parts are so disposed that the projections of either part touch those of the opposite part, as is clearly shown at Fig. 1. Then a plurality of cross-channels m m are formed between the several cooler parts, and through these channels m m the air is passed for cooling the surfaces of the plates a a. As will be seen from Fig. 1, these cross-channels m m are comparatively narrow, so that the air passing through them can be utilized to the utmost for cooling the surfaces of the plates (4 a.

The surface-cooler may serve various purposes, according to the circumstances, and will require to be adapted to the respective machine parts, devices, and so on. It is immaterial of what construction the two reservoirs (Z and c are and in what manner the liquid is supplied to the one, (Z, and discharged from the other, e. In all cases the liquid passing through the surface-cooler is divided into several very thin streams, which during their passage through the cooler parts are constantly baffled and deflected in the zigzag passages ]L It, so that every particle of the liquid is subjected to the cooling effect of the plates a a. The air passing through the several cross-channels m m is therein conducted and obliged to take up the heat from the surfaces of the plates (0 a. Preferably the air is sucked or forced through the several channels or m in any known and approved manner in order to increase its cooling effect.

When employed in automobiles or autotrucks, the parts of the surface-cooler are made of a convenient length and breadth and inclosed in a suitable space between the upper reservoir (Z for warm water and the lower reservoir 6 for cooled water. On the one side of the spacefor example, on the left or on the right in Fig. 2a fan or the like is disposed in a well-known manner and arranged to be driven from the motor, so that it will suck or force (as the case may be) the air through the cross-channels m m.

The surface-cooler may be varied in many respects without deviating from the spirit of my invention. The bosses Z) .7), which are shown as circular, may have any other shape, or they may be replaced by distance-pieces proper. The sharp edges of the cross projections g 9 may be a little rounded off.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a surface-cooler, the combination with two plates of sheet metal each sopressed or stamped as to form a plurality of cross channels and projections of triangular cross-section which alternate one with the other and leave between them plain parallel parts, of means for keeping said two plates at a small distance apart and closing their edges, whereby a narrow zigzag channel is formed for the liquid passing longitudinally from the reservoir for warm liquid to the reservoir for cooled liquid.

2. In asurface-cooler, the combination with two reservoirs, one for warm liquid and one for cooled liquid, of two plates of sheet metal each so pressed or stamped as to receive a plurality of cross channels and projections of triangular cross-section alternating one with the other and a projection along the one edge, which rests on the opposite edge of the other plate, plain parallel parts being left between the cross channels and projections, the two plates being so placed on each other and connected at the ends with said two reservoirs, that a narrow zigzag channel of nearly uniform thickness is formed for the liquid passing through, and solder filling up the edge spaces of said two plates, the external faces of said two plates being subjected to the cooling effect of air.

3. In asurface-cooler, the combination with two reservoirs, one for warm liquid and one for cooled liquid, of a plurality of pairs of plates of sheet metal, each plate being so pressed or stamped as to receive a plurality of cross channels and projections of triangular cross-section alternating one with the other and a projection along the one edge, which rests on the opposite edge of the other plate and leaves an external space to be filled up with solder, plain parallel parts being left between the cross channels and projections, the two plates of each pair leaving between them a narrow zigzag channel of nearly uniform thickness and being connected at the ends with said two reservoirs, the several pairs touching each other with their projections and forming between them a plurality of crosspassages for the cooling-air.

4. In a surface-cooler, the combination with two reservoirs, one for warm liquid and one for cooled liquid, of a plurality of pairs of plates of sheet metal, each plate being so pressed or stamped as to receive a plurality of cross channels and projections of triangular cross-section which alternate due with the other and leave between them plain parallel parts, a plurality of bosses in the plain parts between the channels and projections and a projection along the one edge, which rests on the opposite edge of the other plate and leaves an external space to be filled up with solder, said bosses resting on plain parts of the other plate and serving as distance-pieces, so thata In testimony whereofIhave signed my name narrow zigzag channel of nearly uniform to this specification in the presence of two sub- IO thickness tor the liqulild is forineill between scribingwitnesses. the two p ates of eac pair WliO are con- I 5 nected at the end to said two reservoirs, the TILHELM HOHBACH several pairs touching each other with their Witnesses: projections and forming between them a plu- RICHARD ZAHN, rality of cross-passages for the cooling-air. ERNST ENTENMANN.

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