US2354131A - Refrigerating apparatus - Google Patents

Description

L. U. LARKIN July 18, 1944.

REFRIGERATING A PARATUS ets-Sheet 1 7 Original Filed March 19, v1938 2 She 4+- m /d {INVEN/TOR,

-14; ATTORNEY.

July 18, 1944. L. u. LARKIN REFRIGERATING APPARATUS Original Filed March 19, 1938 2 Sheets-Sheet 2 i z 'fl 1 m, 4:510 Q l 56 g Qi p Q12!) 5 a 611'!) QIID g pads KINVIENTOR,

A54, ATTORNEY.

Patented July 18, 1944 oar-loaaarmoaaarmc APPARATUS Lester U. Larkln, Chicago, 111., assignor to Lul Products, Inc., Baltlm of Maryland ore, Md., a corporation Original application March 19, 1938, Serial No. 196,881. Divided and this application August 28, 1941, Serial No. 408,564

2 Claims.

The present application is a division of my copending application Serial No. 196,881, flled on March 19, 1938, which has become Patent No. 2,258,618, issued October 14, 1941.

My invention relates to the art of heat exchange, and more particularly as involved in refrigeration.

One of the objects of my invention is to provide an improved heat exchanger coil suitable for use as an evaporator, including sectional end plate supporting structure and an improved arrangement for securing the sections of the end plate structures together.

Refrigerated show cases, such as are used in retail stores, are manufactured in a great variety of sizes and shapes. As a rule, the show case itself and the refrigerating apparatus are manufacturcd by different concerns, and while that portion of the apparatus consisting of the motor compressor, condenser and controls may be more or less standardized, the evaporators must be furnished in many difl'erent sizes or shapes in order to be accommodated properly within the different show cases. In accordance with my invention an evaporator coil of practically any dimensions maybe fabricated from standardized parts.

Further objects and advantages of my invention will be apparent from the following description considered in connection with the accompanying drawings, which form a part of this specification, and of which:

Fig. lis a perspective view of a completed coil in accordance with my invention;

Fig. 2 is a cross-sectional view'on an enlarged scale taken on the line 2--2 of Fig. 1;

Fig. 3 is a cross-sectional view taken on the line 3-3 of Fig. 2;

' Fig. 4 is a cross-sectional view taken on the line 4- 4 of Fig. 3;

Fig. 5 is an enlarged cross-sectional view of a portion of the device shown in- Flg. 4;

Fig. 6 is a view similar to Fig. 5, but showing certain parts in different position;

Fig. 7 is a side-view of a tool employed in the construction of the coil shown in Figs. 1 through 6- r Fig. 8 is a cross-sectional view taken on the line 8--8 of Fig. 7;

Fig. 9 is a cross-sectional view taken on the line 9-9 of Fig. 7;

Fig. 10 is a cross-sectional view takenv on the line Illl0 of Fig. 7; and

Fig. 11 is across-sectional view of a different form of coil.

Referring more particularly to Figs. 1 through 6, reference character Ill designates generally a pipe coil consisting of straight tubes I2, all except two of which are connected at opposite ends to adjoining straight tubes by means of return bends I4. One end of two of the straight tubes is provided with a flared fitting [6, by means of which the coil may be connected to the suitable conduits leading to the usual compressor and condenser.

Secured in heat transfer relation to the straight tubes I2 is a plurality of closely spaced heat transfer fins l8. As shown, each fin is secured to two adjacent tubes, which are connected together by a return bend I 4, the fins being provided with openings through which the tubes extend. Each pair of tubes to which the same fins are attached, together with the return bend connecting the tubes together, constitutes what may conveniently be termed a hairpin. While the flns may be secured on the tubes in any desired manner, a preferred method and apparatus for accomplishing this is described and claimed in my above mentioned application Serial No. 196,881, of which this application is a division, as well as in another divisional application, Serial No. 404,105, flled on July 26, 1941.

A complete evaporator coil consists of any desired number of hairpins joined together and supported in end plates 20, as is shown in Fig. 1. The end plates 20 are made up of a plurality of sections, including a lower section 22, an upper section 24, and intermediate sections 28. lower section 22 is formed with an out-turned flange 28 along its lower edge and an inturned U-shaped flange 30 along its upper edge. Each of the intermediate sections ls formed with an inturned flange 32. At equally spaced points along flange 32, ears 34 are provided. U-shaped flange I0 is provided with apertures '36 at similarly spaced points. The upper edge of each of the intermediate sections 26 is formedwith a U-shaped flange :oa, similar in all respects to the flange on the lower section. The lower edge of upper end section 24 is formedwith an inturned flange similar in all respects to the flange 32 formed on the lower edges of section 26. Upper section 24 is also formed with an out-turned flange 28a, similar to flange 28 on the lower end section. Each of the intermediate sections is formed with substantially semi-circular openings along their mating edges, while the lower section 22 is formed with such openings along its upper edge and the upper sec tion 24 is formed with similar openings along its lower edge. The radius of these openings is Substantially equal to the radius of the tubes forming pressed toward each other.

located at one end of the coil, the opposite ends. 7

An intermediate section is then put in place by slipof the tubes being as yet unconnected.

ping the flange 32 thereon between the legs of the U-shaped flange 30 in the lower section, and

with the ears 34 extending through the apertures 36, as is shown in Fig. 5. The next step is to bend-the ears 34 tothe position shown in Fig. 6, and for this purpose a'tool shown in when it is drawn into place between the legs of the u-shaped flange 30, it pulls the sections 22 and 26 together. Inasmuch as the openings in the edges of these sections are slightly less than semi-circular, when they a ie. pulled together the edges of the openingsuare securely clamped around the tubes which extend theret'hrough.

Thereafter, another row of hairpins is placed in the'openings in the upper edge of the intermediate section and another intermediate section of end plate is secured thereto in the same manner as just'described. This is repeated until Fig. 7 is provided; This tool includes a vertical-' ly extending arm '18 rigidly secured to which is a.

handle 4|). Pivotally mounted on arm 38 at 42 is a member 44 having parallel guide channels 46 extending downwardly on one side of arm 38, and an arm 48 extending 'downwardly'on the other side. Slidably mounted in channels 46 is a bending bar 'orplunger "the upper end of which extends above the guide channels and is normally held in a raised position by means of one end'of a spring 52, which spring'is wrapped around the pivot 42. The other'end of the spring engages arm 48 and tendsto rotate the arm in a clockwise direction as viewed in Fig. "I. Pivotally secured to the upper end of the arm 38 at 56 is a cam 58 integral with a handle 60. The face of cam 58 bears against the upper end of bending arm 50 and, when the cam is rotated, forces the bending bar downwardly against the force of spring 52. A handle 82 is pivoted to arm 38 at 31 and has an arm 6i contacting the inner side of arm 4!.

'a coil of the. desired size has been assembled,

whereupon an upper section 24 is fastened in place. A sufllcientnumber of return bends i4 are applied tothe free ends of the hairpins, by soldering them thereto, thus connecting the various hairpins together in the manner shown in Fig.1. Flared fittings Ii] are applied to the free ends'ofthe coil, and provide meansforconnecting the evaporator coilin a refrigerator system.

In the coil shown'in Fig. 1, theflns on all the'hairpins forming the coil extend in the same direction. However, this is not essential anda coil may be made'up in other ways, for instance as shown in Fig. 11, wheresome of the .ilns are-horizontal while others are'vertical. .Thus a coil-of almostany proportions maybe fabricated.

It is to be understood that the foregoing description has been given for purposes of illus- In operation, the .above described t'oolis ap-" plied to the two sections of the end plate which are to be secured together, in'the manner'shown in Fig. 7, that is, with a bearing face 68 of arm II in contact with the outer surfaces of 1 the two sections. Guides 46 extend downwardly on the inside of the plates and, by squeezing handies '40 and 82 together, arm 48 is rotated in a counter-clockwise direction so as to bring guides 46 against the inner edges of the U-shaped flanges and 30a. The tool is so located that the ear 34 extends between the two guide channels 48, the lower' end of the bending bar Bil being above the ear. Thereupon, handle 60 is rotated in a clockwise direction, as viewed in Fig. 7, so

as to cam the bending bar 50 downwardly. 'During this movement arms and 62 are held 7 The lower end of bar 50 strikes the ear 34 and bends it from the position shown in Fig. 5 to that shown in Fig. 6, In this bent position, the earsecurely fastens the two sections of the end plate together.

As is shown in Figs. 5 and 6, flange is'dlsposed at slightly less than 90 with respect to the front surface of the plate. Consequently,

tration only as showing preferred embodiments of the-various structures in accordance-with my invention, as, is required by the patent statutes. It is not, to be considered as limiting the scope of my invention, which is to be-determined by the appended'claims. r

, What is claimed is:

1. End plate structureior a tubeheat exchanger including apluralityof sections having edges meeting along the centerlines of the tubes, the

edge of one section being i'ormed with a U- shaped flange having spacedapertures, and the adjacent edge of. an adjacent section being formed with, a flange adapted to berreceived within said U-shaped flange and with projections adapted to extend through said apertures.

2. A heat exchanging unit having parallel rows of pipes, a supporting standard for said pipes including a series of plates extending substantially atright angles to said pipes, and means for detachably connecting adjacent plates together including a flange on'the edgerof one plate bent over a flange formed on the edge of the adjacent plate, the first named flangebeing provided at its return bend with a series of spaced apart slots, the second named flange having tabs prosecure said plates-t0 each'z-other.

LESTER U.

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