US1622376A

US1622376A - Apparatus for refrigerating systems

Info

Publication number: US1622376A
Application number: US54867A
Authority: US
Inventors: Ransom W Davenport
Original assignee: Chicago Pneumatic Tool Co LLC
Current assignee: Chicago Pneumatic Tool Co LLC
Priority date: 1925-09-08
Filing date: 1925-09-08
Publication date: 1927-03-29
Anticipated expiration: 1944-03-29

Description

, f v 15622376 March 29 1927 fn. DAVENPORT APPARTUS FOR REFRIGERATING SYSTEMS Filed Sept. 8, 1925 INVENTOR /Pamsom Wave/fpor Patented Mar." 29, 1927.

" UNITED STATES iPArENT oFF-ica.

muscu w. Davmrronr, or DETROIT, MIGHIGAN, AssIGNon. To. cnicaeo PNEU- xaTIc Toor. comm, or NEW YORK, 1a. y., A conroaaTIoN or Naw .maant APPARATUS FOB BEFBIGERATING SYSTEMS.

Applicatien med-September 8, 1925. Serial No. 54,862. I

This invention relates to apparatus for use in mechanical refrigerator systems with particular reference to the heat absorbing mem# bers or elements commonly designated as evaporators.

It is customary to design evaporators with sole regard to the quantitative proportioning of their internal and external areas, and their internal cross section. For example, steam boilers are usually `designed with these points principally in mind. Likewise refrigeratmg boilers or evaporators are usually figured simply on the basisv of total heat transferring surface.

This invention is particularly -adapted to refrigerating systems employing working substances which are slow in evaporating, such as mixtures of liquid, vapor, and gas, and one of its; principal objects is to provide an evaporator adapted to be employed in the cooling of domestic refrigerators of the mechanically ,operated type utilizing such` a working substance and providing a'- for convectiveconsiderable external area heat transfer. y

Evaporators hitherto known or used for this and other similar applications are not well'=suited to my vpurposes for many reasons. -All common constructions have a broken or irregular external surface-coils, stacks, finned tubes, and the 1ike--, actually amenace to health when used for'my purposes since l'they cannot be easily kept in a clean and sanitary condition. On the other hand, all known forms in which the external surface is smooth and easily cleaned are lackin `in one characteristic particularly desirab e where slow evaporating substances are involved, namely, the length of travel of the working substance, which is required in order that time may be allowed for the liquid to evaporate into equilibrium with the vapxtlir.

' order to illustrate the invention one concrete embodiment thereof is disclosed in the accompanying drawings -in which:

Fig. 1 is a side lelevational view;

Fig. 2 a vertical transverse sectional view, substantially on the line 2-2 of Fig, 1; and

Figs. vational view and a plan view of one Aform X of baille core.

The improved type of evaporator element comprising the present invention is formed,

3 and 4 are respectively a side ele` as illustrated, of plates of sheet material,

'preferably of metal Aor other suitable heat conducting material, secured together vin face to face engagement and so formed aS to provide between the plates an elongate pas-v sage, conduit, or chamber,- in which liquid refrigerant may be disposed. In the drawing the two plates forming the refrigerating element or evaporator are indicated by the

reference characters

3 and 4. In order to provide the elongate fluid passage between Athe plates at least one of the plates such as v plate 3, has raised portions 3. By preference, however, both of the plates forming the element have raised portions 3 .and 4 together in the manner shown the raised portions register in op- A Aposition so thatthe velongate vpassage is disposed partly within both plates.

In order to adapt the evaporator element I to refrigerating systems utilizing a'workmg substance which 1s slow to evaporate, such as a physical mixture of a liquid and a gas substantially inert to and insoluble in the liquid, the passage formed in the element must be of considerable length to provide lthe necessary time factor. The. evaporator element, as illustrated. While the passa ev may be uniform in size or progressive y' larger from end to end or with one or more progressively larger portions, it is disclosed in the .drawin ing a -part b of small size adjacent the inlet 5 at the bottom of the element and a part c ofA larger size taking upthe greater part of the remainder. The upper end of the larger passage c preferably connects with, or opens into, a chamber d, also formed between the

plates

3 and 4 and havingtherein baille means ein the form of a core extending longitudinally of chamber d so that the latter acts as a separator chamber and prevents entrained liquid from being drawn into the outlet pipe 6 which is connected tothe suction side of the compressor or as differential in size, hav-` f loo respectively, these raised portions being complementally disposed t erein so that when the plates are assembl y refrigerating system is disclosedin my pump (not shown) of the rerigerating apparatus.

AOne simple and economical method of forming the element A is to take sheet metal having the requisite strength and to form the complemental raised portions therein by stamping the plates between (dies. The baie core e, which may be of an suitablev form such as a mass vof spaced p ates, is secured in proper position toone of the plates and then the two plates are assembled in face engagement withl the raised portions thereof in opposed registration as indicated in Fig. 2. The plates may be secured together in any desired manner as by welding, soldering, and even by crimping the edges as indicated in the drawing if suitable sealing material impervious to the working substance is used to sealv the plates adjacent the continuous passage formed by raised portions b and c. After the element A has been formed, its

external surface may be treated, if necessary or desirable, in any desired manner to give it a smooth and easily cleaned surface, one method being to coat the exterior with vitreous enamel. One way of installing the ele-` ment and connecting it into a mechanical eopending application Ser. No. 47,457 filed August l, 1925 entitled Refrigerating and iee making cabinets.`

. Figs.3 and`4 illustrate a preferred form of baille core e. The core isv constructed of a plurality of plates f, each corrugated with the corru ations angularly disposed `relative to the si es of the plate, the plates being so'disposed in face engagement that the corrugat-lons cross each other as indicated in Fig. 3. The plates are united to form the core in ,an suitable manner as by having the ends thereof soldered together. Such a core provides tortuous passages for the va or, which is. drawn out of chamber d, an effectively separates from the vapor substantially all of the entrainedliquid.

From the above it will be apparent that the present invention discloses a simple :form of heat absorption element for use in mechanical 'refrigerating systems which can be easily and economically manufactured, which is adaptable to systems using working substances which evaporate slowly and reuire time for the va or of the liquid reigerant to reach su stantial equilibrium in conformity with the change in temperature, and which presents a smooth exterior surface without deep pockets and inaccessiblecrevices thus enabling it to be easily .kept in a clean and sanitary condition.

am aware that the invention is adapted to varied conditions and usesincluding apparatus for condensing the vaporized refrigerant and that such adaptations may involve departures from the specific form illustrated in the accompanying drawing comprising two plates of sheet material in' fluid-tight face-to-face engagement at least as to their peripheral portions. one of said plates being formed with raised portions providing between the plates an elongate passage,

3. member for use as an element in a mechanically operated refrigerating system comprising two plates of sheet material se# cured together, both of said plates being stamped to form complemental raised por-4 tions, said plates being secured directly'to each other with their complemental raised portions opposed whereby said plates cooperate to form anelongate passage therebetween.

"4. A member for use as an element in a mechanically 4operated refrigeratin system comprising plates of sheet materia secured" to each other in yface engagement in a fluidtight manner and roviding therebetween an elongate passage iiferential in size.

5. A member fbi' use as an velement in a mechanically operated refrigerating system comprising two plates of sheet material secured together, onel of said plates being formed with raised portions providing bctween the` plates an elongate passage dif.- ferential in size, the Hat portions of said plates being placed together in face engagement and united in a luid-tight manner.

6. A member for use as an element in amechanically operated refrigerating system comprising relatively thinv plates of heat conducting material secured together in face engagement and providing therebetween an elongate passage enlarged at one` point to form a chamber.

7. A meinberfor use as an element in a mechanically operated refrigerating system comprising two plates of sheet material se- -cured together, one of said plates havingv portionsraised above its plane to form between the latesan elongate assage' having an en argement or cham )er adjacent one end.

les

8. An evaporator for a mechanically A operated refrigerating system comprising plates of-sheet material secured together in face engagement` and providing therebeiao \ megeve tween an elongate sinuous passage terminating in an enlargement or chamber, and

b aiile means within said chamber.l

9. An evaporator' for 1i uid refrigerant comprising two plates of heat conducting material secured together in face 'engagement9 said plates having complemen al raised portions in' opposed' registration forming an elongated simous passage teru minating at the top of the evaporator in a chamber.' the outlet of said evaporator being connected to said chamber-,and a baie core within said chamber intermediate said outlet and said passage to lrevent liquid entrained with the vapor oft a4-refrigerant from passing through said outlet when the,

evaporator is-in use.

10. An evaporator for. liquid refrigerant comprising two` plates of sheet materlal secured together 1n face engagement, said plates being stamped to form complemental raised portions sinuous passage differential in size and terminating in an enlargement or chamber, the loutlet of said eva orator being connected to 'said chamber, an

chamber intermediate said outlet and said1 passage to prevent liquid entrained with the vapor of the refrlgerant from passing a baie core Within said providing an clongate,

g through said outlet when the evaporator is in use. A

1i. A. thin, flat evaporator element formed of sheet material having an elongate fluid passage therein and bame means in a portion of said passage.

I12., A thin, flat evaporatorelement formed v of sheet material .and providing a fluid passage therein of substantial length, said passage beingenlarged at one point to form achamber. ',w

. 13. A thin, a'teva rator element formed of. sheet material an providing an elongate 'fluid passage therein differential in size and 4terminating at one en'dof said element in an enlargement or chamber.

Ransom W., navarros@l therebetween an elon- M 14. A-thim atevaporator element formed f