US2573583A

US2573583A - Plate type refrigerant evaporator

Info

Publication number: US2573583A
Application number: US720128A
Authority: US
Inventors: Thomas O Lester
Original assignee: KOLD HOLD Manufacturing CO
Current assignee: KOLD HOLD Manufacturing CO; KOLD-HOLD MANUFACTURING Co
Priority date: 1947-01-03
Filing date: 1947-01-03
Publication date: 1951-10-30
Anticipated expiration: 1968-10-30

Description

Oct. 30, 1951 Filed Jan. 3, 1947 T. O. LESTER PLATE TYPE REFRIGERANT EVAPORATOR 2 SHEETS-SHEET l /NVENTOR Thomas O. LesTer ATTORNEY 0611. 30, 195] Q LESTER 2,573,583

' PLATE TYPE REFRIGERANT EVAPORATOR Filed Jan. 3, 1947 2 VSHEETSS;-IEET 2 Q J 27 l;

27 F|G.4. 5 I FIG.5.

FIG.6.

' 'INVENTOR Thomas O. Les-rer ZZ/WW W ATTORNEY Patented Oct. 30, 1951 OFFICE PLATE TYPE REFRIGERANT EVAPORATOR Thomas 0. Lester, Downers Grove Township, Du Page County, 111., assignor to Kold-Hold Manufacturing 00.,v Lansing, Mich., a'coi'poration of Michigan Application January 3, 1947, Serial No. 720,128

3 Claims.

This invention relates to heat exchangers and more particularly to heatexchangers of the socalled plate type. v

The principal object of the invention is to provide a heat exchange plate of particularly simple and economical construction.

Another object is to provide a heat exchange plate in which passageways for fluid are defined in part by rods bent'into serpentine form.

These objects will more fully appear in the following specification when read in connection with the accompanying drawings, wherein:

Figure 1 is a plan view of an evaporator plate embodying the invention;

Figure 2 is a cross-sectional view taken on substantially the line 2'2 of Figure 1;

Figure 3 is a plan view of one side wall of the evaporator with a pair of serpentine rods in place thereon;

Figure 4 is a 'plan view of a modified formof heat exchanger embodying the invention;

Figure 5 is a cross-sectional view taken on substantially the line 5-5 of Figure 4' and Figure 6 is a plan view of the heat exchanger with one wall thereof removed.

The invention is shown in Figures 1 to 3 as embodied in a refrigerant evaporator of the socalled hold-over plate type, but it will be evident that the invention is not limited to evaporators of this type, nor ever to evaporators, but may be utilized either in heating or cooling systems.

The evaporator illustrated in Figures 1 to 3 includes a container I formed from two sheet metal side walls II and I2. Side wall II is pressed into a shallow dish shape. A flange I3 surrounds the perimeter of the side wall II. The openings are formed in the ends of side wall II to receive a pair of couplings I4 and I as will more fully appear presently. Filler openings closed by a removable threaded plug I5 are also formed in side wall II adjacent opposite corners thereof.

Side wall I2 is flat and of the same size as side wall II. The two side Walls are seam welded about their perimeters in the region of the flange Passageways for refrigerant are formed in the container ID by means of a pair of rods I1 and I8. The rods are preferably copper clad steel. They are bent into similar serpentine configuration as shown in Figure 3, so that when arranged as shown they are spaced equidistantly throughout their linear extents.

The two bars are arranged as shown and the couplings I4 and I5 are brazed or otherwise secured to each pair of adjoining ends. The ends of the couplings I4 and I5 adjacent the rods I1 and I8 are of the same thickness as the diam* eter of the rods I1 and I8 so as to fit tightly against the side walls II and I2. Preferably the couplings are copper clad also.

One surface of the side wall I2 is coated with a suitable flux and the rods I! and I8 are laid upon the fiuxed' surface in the position. shown in Figure 3'and ftacked thereto by brazing or soldering. The side wall II is then coated with flux on its inner surface and placed over the rods I I and I8 and side wall I2. The couplings I4 and I5 are inserted in the openings in the wall I] adapted to receive them.

The two side walls II and I2 are clamped firmly in position, pressure being applied in. such a manner as to bring the inner surfaces of the side walls into contact with the rods IT and I8. Heat is then applied to fuse the copper coating of the rods to the inner surfaces of the side Walls. The edges of the side walls are seam-welded togetheras mentionedvabove. The welding may be done either before or after brazing the rods to the side walls.

From the foregoing it will be seen that a serpentine passageway I9 is formed between the rods I1 and I8 extending from coupling I4 to coupling I5. The space within the container I0 outside of the passageway I9 is filled with a suitable eutectic solution through the filler holes, and the latter are then closed by plugs I6.

Couplings I 4 and I5 may be connected to a refrigeration system of the compressor-condenser type and refrigerant passed through the passageway I9 to solidify the eutectic solution. The connections may be permanent, as in a fixed installation, or may be disconnected when the plate is employed in a movable refrigerating unit such as a truck or railway car.

Instead of using copper clad rods and couplings corrosion resistant steel without coating may be employed. In that case, then sheets of brazing metal are placed between the rods and the side walls prior to brazing.

Figures 4 to 6 illustrate a modified form of the invention. It comprises a container 20 comprising a pairof Walls 2| and 22 spaced apart by

bars

23, 24 and 25 positioned between the walls 2I and 22.

The walls 2| and 22 are flat sheets of metal of generally rectangular shape, the corners of which preferably are rounded as shown. Wall 2I is provided with two

drawnecks

26 and 21 for a purpose which will presently appear.

Preferably, although not necessarily, the

bars

23, 24 and 25 are of rectangular cross-section, and are all of equal thickness. The bar 23 is bent to conform to the shape of the perimeters of the walls 2| and 22. The two ends of the bar 23 are arranged in abutting relation and are brazed or welded together at28. 1 v

The

bars

24 and 25 are all of equal length and are somewhat shorter than the lengths of the walls 2| and 22. The

bars

24 and 25 are arranged upon the wall 22, asshown in Figure 6, H

with the bars 24 abutting the bar 23 at the left hand end of the heat exchanger (as viewed in- V Figure 6), and the bars 25 abutting the bar "23 at the other end of the heat exchanger. The wall 2| is then laid upon the

bars

23, 24 and 25 and the assembly clampedrtogether after.

which they are joined together by brazing or welding.

If the bars are to be brazed to the walls 2| and 22, either the bars must be copper clad, or brazing metal must beplaced between the bars and the walls, as in the case of the modification previously described. On the other hand, the bars may be welded to the walls after'assembly of the parts in the manner described.

It will be apparent from the foregoing that the walls 2| and Hand the bar 23 form a container having inlet and outlet ports at the

drawnecks

26 and 21. Within the container is a serpentine passageway for fluid, formed by the walls and the

bars

24 and 25.

L From the foregoing it will be seen that the present invention provides a novel heat exchanger of very simpleand economical construction.

.The scope of the invention is indicated in the appended'claim's. 9

II la 1 V '-'1..A' hold-over evaporator comprising a con-, tainer 'formed from a pair of spaced apart side walls joined together in fluid tight engagement throughout'their perimeters, a pair of elongated rods of serpentine shape between said side walls, said rods being of similar shape and spaced apart throughout their linear extents, each of said rods said side walls throughout the linear extents of said rods.

3. A 'heat exchanger comprising a container including a pair of relatively closely spaced parallel side walls, means joining said side Walls together in fluid tight engagement throughout their perimeters, .a pair of elongated rods of generally similar serpentine shape arranged in spaced relation between said side walls and united to said side walls throughout the linear extents of said rods, said rods cooperatingwith said side walls to provide a serpentine passageway for fluid and spaces outside of said passage,- way for a eutectic solution, and means on said container for coupling the. ends of said passage way to a fluid circulating system.

THOMAS O. LESTER.

REFERENCES CITED The following references, are of record in the file of this patent? UNITED STATES P ATENTS