US2200426A

US2200426A - Baudelot water cooler

Info

Publication number: US2200426A
Application number: US277943A
Authority: US
Inventors: Edward G Lehman
Original assignee: YORK ICE MACHINERY CORP
Current assignee: YORK ICE MACHINERY Corp
Priority date: 1939-06-07
Filing date: 1939-06-07
Publication date: 1940-05-14
Anticipated expiration: 1957-05-14

Description

E. G. LEHMAN BAUDELOT WATER COOLER 2 Sheets-Sheet 1 Filed June 7. 1959 3nventor (Zttornegs E. G. LEHMAN BAUDELOT WATER cboLER May 14, 1940.

2 Sheets-Shet 2 Filed June 7, 1959 v V I 3nventor 526mb efefmuq/w Gttomegs Patented May 14, 1940 UNITED STATES PATENT OFFICE.

2,200,426 IBAUDELOT WATER coon-1n.-

Edward G. Lehman, York, Pa., assignor to York- Ice Machinery Corporation, York. Pa., a corporation of Delaware Application June 7, 1939. Serial No. 277,943

Claims. (61. 257-256) 5 ing and in cooling potable liquids, particularly I water and milk in which extremely-high stand ards' of sanitation impose correspondingly high,

standards of finish and ease of cleaning.

Non-corrosive steels are now considered the l0 ideal material, but their use requires the manufacture of precise steel stampings which are weld ed together to produce the finished plate or leaf. The die costs are high and the market rather limited, so design of aplate in such a way that identical stampings can be used is a matter, of

more than usualimportance. v

The present invention provides a plate composed of two main stampings which are identical and hence can be produced by a single set of dies.

Similarly the in and out connection'flttings are identical and are symmetrically attached to respective main stampings. This is advantageous from the standpointof economy and also because the fittings do not connect through the joint between the two stain-pings. This permits better and-stronger joints to be made.

' Finally the number of flovf passes in a complete plate or leaf is not dependent on the design of the stampings but is determined by inserts which are welded in place before'the two main stampings' are "assembled with each other and welded. I

Hence, a single set of dies can produce plates of a given size and configuration which difier from each other in the number of passes, arrangement of passes,- or both.

' It is even possible to use more than one inlet and more than onemutletfand tosegregate from each other distinct portions and passes in a single plate, adapted for heat exchange fluids of different temperatures... ,However. double path plates areknown and since the-elaboration involves only duplication and mechanical skill in applying the invention present in a single path plate, a simple commercial embodiment has been chosen for illustration and detailed discussion and as the in one header boss near its end, and the metal is basis of claims, but with the understanding that various specifically different embodiments are possible within the scope of the'invention.

In the drawings:

Fig. 1 is a face elevation of a simple plate with one inlet and one outlet connection. Portions are broken out to reduce both the height and width or the view, with the result that 'the co nections appear at first glance to be out of scale ,with the plate.

Fig. 2 is a right-hand edge view of the plate of Fig. 1 (i. e. looking to the left at Fig. 1).

Fig. 3 is a section in theline 3-3 of Fig. l. Fig. 4 is a perspective view of the two main stampings before wel'ding together, each with the. 5

corresponding flow connection attached. T In this view the stamping to the left is viewed from its external (relief) side and that to the rightfrom the internal (intaglio) side, with the pass-defining inserts in place. ings which are identical are shown ready for assembly and welding.

Fig. 5 is a perspective view of one of the inserts. Fig. 6 is a perspective view showing the insert welded in place. 15

Fig. 7 is a fragmentary vertical section showing the formation of the passes and the seam-welds between them.-

The two main plate stampings II are identical and hence made in the same dies. They are as- 20 sembled in such a way that if either stamping II were rotated about a horizontal axis at its; mid height and in the mating plane it would assume the position of the other stamping. State- I ments of direction just made refer to Fig. 1 .7 25

The median plane of the complete leaf,'which.is the mating plane on which the main weld is made is the plane of the inner face of the marginal flange l2. .Adjacent this flange are two vertical header bosses l3, both struck out from the 30 median plane. Connecting the two header bosses l3 are a plurality of horizontal pass bosses I, also struck out from the median plane and merge ing with the headers. i i 1 The header bosses l3 are senii cylindrical and 35 where two plates are assembledform vertical tubular headers circular in cross section (see Fig. 3). The horizontal pass bosses ll amount really to a series of corrugations, the corrugations of the two stampings contacting on the median plane on successive inner crests, and there seam welded as indicated at 15 (Fig. 7). The welds l5 are in the plane of the main marginal welds l6 which connect the flanges 1'2.

. In forming the main stampings a slot is formed 45 Dressed to form a flange I! which with the ad.ia. cent portion of the marginal flange I 2 Iowa socket to receive the end of the flattened flaring fitting". 'Two stayplates iii are welded into the 5 flattened mouth of the flttingto resist distortion as bestshown in Figs. 2 and 3, the fitting is is u Thus the two main stamp- 10 oflset so that the threaded nipple 2l, which is .welded to it at 22 is centered on the median because it gives good distribution to the several horizontal passes which provide for the first flow across the plate, and similarly provides for smooth flow to the outlet from the last pass. The fact that it enters the header tangentially (see Fig. 3) is also a. valuable feature contributing to good distribution.

Since the inlet and outlet connections are on the same vertical edge of the plate, an even number of flow paths across the plate and back are needed. Heretofore, this has been provided for in the stamping of the plate. An important feature of the present invention is the use of flow directing means which may be variously located in the headers before the two main stampings are welded. Thus, a single design of stamping can be .used to produce plates which are externally'iden" tical, but which have different pass arrangements.

The flow directing means takes the form of an insert 23 which serves as a barrier (Figs. 5 and 6). The insert 23 is generally circular to conform to the internal contour of the header. -It has small projections 24, 25. These are formed to fit, respectively, the reverse curve leading to the weld H5 (in the plane of one of which welds the insert 23 is mounted), and the slight filletsbetween flanges l2 and respective header bosses I 3.

Each insert 23 except along the projections 24, 25, has a flange, 26,,21' Before the stampings II are welded together the fittings I8 are welded in place and the inserts 23 are mounted in proper position, each insert being spot welded to a stamping at points in a flange 26 or 21.

Then the two stampings are clamped together in proper relative positions, and the flange welds iii are made. Next the seam welds i5 are made.

The order in which the welds l5 and 18 are made can be varied.

It is unnecessarjto weld the second flange 26 or 21 of the inserts 23, but this can be done if desired. It is not necessary that the inserts 23 seal absblutely tightly, and since they can easily be made substantially tight, the extra expense ofif assuring absolute tightness is usually not justied. With these inserts 23 located asshown on the right-hand stamping of Fig. ,4, four passes would be provided. One insert would give two passes, five inserts would give six passes, an so on.

After the welding operation is comp eted, the welds are ground and the entire leaf is polished. In use the plate is mounted in a vertical plane with the headers vertical (Fig. 1). A heating or cooling fluid is circulated through the plate entering at one connection l8 and leaving at the other. Volatile refrigerants may be evaporated in, or vapors may be condensed in the leaf, since it is well stayed against distortion by internal or external pressures. The liquid to be cooled I or heated is trickled over the plate according to the usual practice with "Baudelot coolers.

The advantages offered by the invention are important. The design is simple, so that the dies are comparatively simple to make. Only one set of dies is required and can produce blanks for exchangers of various pass arrangements. The

flow characteristics are good for both the internal fluid and the external liquid. An exceptionally smooth external finish is easily attainable. Mechanical strength is good. 1

The construction of various specifically differentheat exchange leaves according to the invention is contemplated, so that detailed description here given is to be taken as illustrative and not limiting.

What is claimed is:

1. A heat exchange plate comprising two identical sheet metal stampings having peripheral mating fiangeswelded together,'the'mating faces of the flanges being in the median plane of the plate, each stamping having two parallel header channel bosses pressed outward from said median plane, and pass channel bosses forming channels connecting the header channels and also pressed outward from said median plane, each stamping having an opening partially bounded by a seat formed in the wall of a header channel, said opening being near the end of the channel-and outside but adjacent to said peripheral flange whereby the flange forms the complemental portion oi -said seat; and flow connection fittings welded to said seats and to said flanges.

2. A heat exchange plate comprising two identical sheet metal stampings having peripheral mating flanges welded together, the mating faces of the flanges being in the median plane of the plate, each stamping having two parallel header channel bosses pressed outward from said median plane, and pass channel bosses forming channels connecting the header channels and also pressed outward from said median plane, each stamping having an opening partially bounded by a seat formed in the wall of a header channel, said opening being near thefiend of the channel and outside but adjacent to said peripheral flange whereby the flange forms the complemental portion,of said seat; and flow connection fittings welded to said seats and to said flanges, the openings being plate, eachstamping having two parallel header channel bosses pressed outward from the plane of the flanges, and pass-channel bosses forming channels connecting the header channels and pressed outward from the median plane, each stamping having an opening surrounded by a seat formed in the wall of a header channel near the end thereof and outside said peripheral flange; flow connection fittings welded to said seats and arranged to direct flow in a direction tangential to said header; and at least one insert welded in a header channel and obstructing the header formed by mating channels in the two stampings whereby at least two successive flow passes formed by pass channels between said flow connection fittings are afforded.

'4. A heat exchange plate comprising two identical sheet metal stampings having peripheral mating flanges welded together, the mating faces of the flanges being in the median plane of the plate. each stamping having two parallel header formed in the wall oi a header channel near the end thereoi and outside said peripheral flange:

. flow connection fittings welded to said seats and arranged todirect flow in a direction tangential to said header, said seats being elongated in the direction of the length of the header and the fitv mating flanges welded together, the mating faces of the flanges being in the median plane of the plate, each stamping havingtwo parallel header channel bosses pressed outward from the plane of the flanges, and pass channel bosses forming channels connecting the header channels and pressed outward from the median plane, each stamping having an opening surrounded by a seat formed in the wall of a header channel near the end thereof and outside said peripheral flange; flow connection fittings welded to said seats and terminating in circular nipples. said fittings being so onset that the axes of said nipples lie in said median plane; and at least one insert welded in ill a header channel and obstructing the header formed by mating channels in the two stampings whereby at least two successive flow passes through passes formed by pass channels between said flow connection fittings are afforded.