US1937802A - Heat exchanger - Google Patents

Description

Patented Dec. 5, 1933 PATENT OFFICE 1,937,so2 HEAT EXCHANGER Alvin H. Baer, Waynesboro, Pa., assignor to Frick Company, Waynesboro, Pa., a corporation of Pennsylvania Application October 12.

4 Claims.

This invention relates to heat exchangers and its object is to provide means for effecting a more rapid transfer of heat than with devices of this type heretofore known.

A further object is to provide means for circulating liquid refrigerant to bring it in more intimate contact with the fluid to be cooled to effect more rapid heat transfer.

Referring to the `accompanying drawing, which is made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a vertical section through the shell on the line l-l of Figure 2,

Figure 2 a side elevation, and

Figure 3 a section on line 3-3 of Figure 2.

In thedrawing numeral 10. indicates a shell preferably of steel of the usual type having end plates 11 and 12.End covers 13 and 14 are secured to the end plates as by bolts or rivets in the usual manner to provide header chambers at each end of the shell. Longitudinal tubes 15 are secured in the end plates and provide communication between the header chambers. Thechamber fat head 14 is divided by apartition wall 16.Ports 18 and 17 are provided in thehead 14 and these ports are connected through' suitable fluid lines with a source of fluid to be cooled. Inclinedbaflie plates 19 are placed in the shell and so arranged as to direct liquid refrigerant toward the center of the shell.Inlet ports 20 are arranged to deliver liquid refrigerant into the shell. These ports are so arranged as to direct liquid beneath thebaflle plates 19. While theinlet nozzles 20 are shown at various positions as entering radially inwardly intoithe shell they may be arranged in other positions. For example, they might come through the top of the shell and extend down inside, with the nozzles positioned at suitable locations in the shell to direct the refrigerant in the direction desired. Anoutlet manifold 21 havingopenings 24 in its upper surface is connected to an outlet pipe 22 for drawing off the evaporated refrigerant.

In the operation the liquid refrigerant is delivered throughpipes 23 andinlet nozzles 20 into theshell 10 beneath theinclined baffle plate 19. Such refrigerant Ias evaporates from the surface of the liquid within the shell is 1931. Serial No. 568,441

shell. This circulation will be greatly accelerated by the evaporation of a portion of the liquid to create in substance an air lift pump. The whole effect of this circulation will be to bring the liquid into more intimate contact with the pipes 15 whichcontain the fluid to be cooled. Thebaflie plates 19 vmay'be arranged at any suitable angle so as to bring about the best circulation of the liquid within the shell. By the use of this heat exchanger more rapid heat transfer is effected since the cold refrigerant is keptin constant circulation among the pipes containing the fluid to be cooled. Any number of baffle plates may be provided and likewise any number ofrefrigerant inlet ports 20 may be pro- 70 vided. Likewise the outlet pipe may be a simple pipe instead of the arrangement shown. IIlhe size of the shell and other operating conditions will determine the number of baflle plates and the number of inlet tubes necessary or desirable, the ultimate purpose being to secure the greatest amount of circulation obtainable in connection with efficient operation.

It will be obvious to 4those skilled in the art that various changes may be made in my device Without departing from the spirit of the invention and therefore I do not limit myself to what is shown in the drawing and described in the specificaton, but only as indicated by the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is: l

1. A heat exchanger comprising a shell having end plates secured to and closing each end, ad-f ditional plates secured to said end plates so as to form fluid chambers at the ends of the shell, one of said chambers having a partition therein dividing it into two compartments, a fluid inlet to one compartment and a fluid outlet from the other, a plurality of tubes secured in the end plates and connecting the chambers at each end `of the shell, dished baflle plates positioned within the shell having their ends secured to the end plates on the shell, said baflle plates being positioned so as to extend over a group of the said tubes, the bafie plates being open at their tops to permit circulation of fluid upwardly through the shell and between the said tubes, a plurality of inlets for cooling fluid into the shell, and a suction positioned adjacent the top. of the shell for drawing off evaporated cooling fluid, Substantially as set forth.

2. A heat exchanger comprising a cylindrical shell having plates closing its ends, an additional lts plate secured at its edges to each of said end plates so as to provide a chamber at each end of the shell, one of said chambers having a partition dividing it into two compartments, an inlet for fluid to be cooled to one compartment and an outlet for said fluid from the other compartment, a plurality of tubes secured in the end plates and forming communication between the chambers at each end of the shell, a pair of baffle lplates having their ends secured to the end plates, the plates being inclined upwardly toward the center of the shell and having their inner upper edges spaced from each other to provide a channel for free circulation of fluid within the shell, said baflle plates being positioned above a group of tubes in the shell and means for supplving cooling fluid beneath the baffle plates, said means being positionedrto direct the said cooling fluid toward the tubes beneath the baflle plates, and a suction connection for drawing off vevaporated cooling fluid. from the shell, substantially asset forth.

3. A heat exchanger comprising a shell having its ends closed by plates secured thereto and having chambers formed at the ends of the shell, one o`f said chambers being divided by a Y partition wall to form two compartments, an inlet for fluid to be cooled to one compartment and an outlet for said fluid from the other compartment, a plurality of tubes connecting said chambers, a hood` formed of a pair of baifle plates positioned within said shell, said plates being secured at their ends to the inner sides of the end plates on the shell, the hood having a plurality of said tubes positioned beneath it, a second similar hood similarly placed within the shell and above the first named hood, each of Las'zsoa said hoods having an opening at their upper sides to permit free circulation of a cooling fluid through the shell and a plurality of fluid nozzles positioned in the walls of the shell and directed so as to deliver cooling fluid through the said tubes and beneath the said hoods, and a suction connection forv drawing voff evaporated cooling fluid from the said shell, substantially as set.

chambers, a hoodformed of a pair of bafile plates positioned within saidA shell, said plates being secured at their ends to the inner sides of the end plates on the shell, the hood having a plurality of said tubes positioned beneath it, a sec-l ond similar hood similarly placed within the shell and above the first named hood, each of Said hoods having an opening at their upper sides to permit free circulation of a cooling fluid through the shell and a plurality of fluid nozzles positioned in the .walls of the shell and directed so as to deliver cooling fluid through 'the said tubes and beneath the said hoods, and a suction connection for drawing off evaporated cooling fluid from the said shell, said suction connection comprising a manifold positioned longitudinally of the shell and having openingsz in its upper side for the entry of evaporatedA cooling fluid, substantially as set forth.

ALVIN H. BAER.

Images