US1804624A - Refrigerating apparatus - Google Patents

Description

May 12, 1931. J. cs. KING REFRIGERATING APPARATUS Filed July 31, 1928 Patented May 12, 1931 UNITED STATES PATENT OFFICE JESSE G. KING, OF DAYTON, OHIO, ASSIGNOR TO FRIGIDAIRE CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE nn'rmennarme APPARATUS Application filed July 31,

This invention relates to refrigerating apparatus of the type disclosed in my application Serial No- 250,407, filed January 30, 1928. I

One of the objects of this invention is to provide an improved form of refrigerant container, particularly adapted to be used as a condenser, which is simple and economical to construct, and which is rugged and substantial when constructed.

Another object of the invention is to provide an improved method of assemblin such containers which reduces the cost an provides a more dependable container.

.Still another object is to provide an improved joint between the diiferent elements or parts of such containers.

Further objects and advantages of the present invention will be apparent from 20 the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown.

In the drawings:

Fig. 1 is a side elevation, partly in section, of a refrigerating condenser constructed in accordance with the invention;

Fig. 2 is an end view of the condenser; Fig. 3 is an enlar ed sectional view of a so portion of the con enser, showing details of a conduit connection; and

Fig. 4 is a view partly in plan, and partly in section (on the line 4--4 of Fig. 3) of the connection shown in Fig. 3.

Fig. 1 shows a container for refrigerant, which serves both as a condenser for gaseous refrigerant and a storage eservoir for the condensed liquid. In this figure, desig-' nates a thin walled sheet metal cylinder which is closed at each end by a head 41 to form a container for refrigerant which is delivered thereto through a conduit connection 42. The surface of the cylinder is helically corrugated by. rolling or otherwise suitably forming a helical groove 43 which extends substantially from one end of the cylinder to the other. Inside of the corrugated cylinder is placed, a second cylinder 45 which is open at one end 46 and is closed at the other end by a plate 47. The space 1928. Serial No. 296,475.

between the plate 47 and the adjacent head 41 forms an inlet chamber 48 for the gaseous refrigerant and the space within the cylinder 45 forms a reservoir 49 for liguid re frigerant. The cylinder 45 fits against the bottom of the helical corrugations and thus forms with the corrugated cylinder a helical passage 50 which leads from the inlet chamber to the reservoir 49 and directs the incoming gaseous refrigerant in a lengthy tortuous path about the condenser before it can reach the reservoir. A third shell is placed outside the corrugated shell 40, the space between the corrugations 43 and the shell 55 forming a passage 58 thru which water is circulated for condensing the gaseous refrigerant in the passage 50. An inlet and an outlet for the condensing water are provided by a connection 59 secured to the shell 55 and communicating with one end of the passage 58, and by a similar connection 59w at the opposite end of the groove. Liquid refrigerant is withdrawn from the bottom of the reservoir 49 by means of a pipe 52 leading to a boss forming a connector 54 for an exterior conduit.

The structure above described is assembled in the following manner. The wall of the inner shell 40 is provided near one end with a hexagonal opening 60, and the outer shell 55 is provided with a somewhat larger opening 61, of any desired shape, in a position corresponding to the opening 60. The shells are assembled with their openings 60 and 61 in alignment, and the boss or connector 54, which has a hexagonal ortion 63 to fit the opening 60, is inserted t rough both openings. The opening 61 is large enough to provide considerable clearance between its edge and the boss 54, for reasons to be explained below. The connector is then peened over the edge of the hexagonal opening to form the flange 64, which flange is then soldered to the inner surface of the inner shell by means of solder 65 having a high melting point, for example a solder consisting of 11 parts by weight of silver, 6.5 parts of copper, and two parts of zinc, which melts atabout 983 C. The outer shell 55 may at the same time be soldered to the inner shell about the opening 61 by means of the same solder. The connector now forms a gas-tight connection with the refrigerant chamber. j

The-innermost shell 45 is then placed within the other shells, the pipe 52 attached, and thereafter the shells are deformed, as by spinning to provide the grooves which afford shoulders for the end plates 41. The end plates are placed in position, after which the ends of the shells are spun over the plates to hold the plates in position. The plates are then soldered to the shells by means of a solder having a melting point below the melting point of the solder 65, and even below its softening point. A suitable solder for this purpose is a composition of 1 part of lead and 1 part of tin, which melts at about 205 C. The shell 55 forms a watertight joint with the shell 40 for the water passage 58. Since the opening 61 is larger than the connector, the jointbetween the shells will be remote from and independent of the connector and its joint with the inner shell. Thus if either of the joints should fail or leak, either water or refrigerant will merely escape into the atmosphere, and neither can become mixed with the other in the refrigerating system.

The reason for using a liigh melting point solder for the connector 54 and a low melting point solder for the end plates is that the end plates are soldered after the connector, and it has been found to be very diflicult and expensive to solder all joints with the same solder without either melting or weakening the connector joint during the subsequent heating for the end plate joint. Furthermore it has been found that in spinning the grooves 70 in the shells and in spinning the ends of the shells over'the end plates, there is a tendency for the shells to creep past each other. Even after the right hand end plate 41 is assembled, there may be enough elasticity in the corrugated shell 40 to allow its left hand end to creep during the spinning at that end. If the shells are soldered together by low melting point solder before the spinning operation, or if the hole 61 does not clear the connector 54, the creeping will cause breaking or weakening of either the joint between the shells or between the shell and connector. It has been found that if the two shells are soldered together about the opening 61 with silver solder as above mentioned, the joint is strong enough to prevent creeping in ordinary cases.

However, if it is found that the shells creep with silver soldered joints, this can be avoided by a modification of my process above described. In this modification, the shell 55 is not soldered to the shell 40 about the opening 61 at the time the connector is soldered in place, but is left free. The hole 61 is large enough to allow creeping of the shells during subsequent spinning without contacting with the connector. Consequently the creeping does no harm, and after the container is otherwise completely assembled, the shell 40 and the shell 55 are soldered together with the low meltingpoint solder. This is easily accomplished without in any way disturbing the soldered connection between the connector 54 and the shell 40.

While the form of embodiment of the invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. A refrigerant container comprising in combination a pair of sheets forming a double wall, and a boss secured to one sheet and passing through an opening in the other sheet, the opening bein larger than the boss to permit relative isplacement of the sheets in the direction of their surfaces.

2. A refrigerant container comprising in combination a pair of sheets forming a double wall, and a boss secured to one sheet and passing through an opening in the other sheet, the opening being larger than the boss and said sheets being secured together at said opening to form a joint between said sheets remote from the boss.

3. A refrigerant container comprising in combination a pair of co-axial shells forming a double wall, a boss secured to one shell and passing through an opening in the other shell, and an end plate secured to the shells, said shells being deformed to hold said plate in position, and said openin being larger than said boss to permit relative displacement of the shells during deformation without disturbing the boss.

4. A container comprising in combination a shell, a conduit connection secured to the shell adjacent one end thereof with solder of high melting point, and a plate secured to the end of the shell with solder of low melting point.

5. A container comprising in combination, a pair of co-axial shells each having an opemng in its wall, a conduit connection passing through said openings and being soldered with solder of high' melting point to the inner shell about its opening, and an end plate soldered to the inner shell with solder of low melting point.

6. A container comprising in combination,

a pair of co-axial shells each having an opening in its wall, said openings bein in alignment, and the opening in one s ell being larger than the opening in the other shell, a conduit connection passing through said openings and soldered with solder of high melting point to the inner shell about its opening, the shells being soldered together about the larger ogemng with solder of hlfh melting dere to said s e in point.

oint, an an end late solw1th solder of ow meltn testimony whereof I hereto aflix my signature.

JESSE G. KING.

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