US1799991A - Refrigerating apparatus - Google Patents

Description

APril 7, 1931- H. K. SELLICK ET AL REFRIGERATING APPARATUS Filed May 13, 1929 JS & mzfaizz AT'TORNEY Patented Apr. 7, 1931 UNITED STATES PATENT OFFICE HAROLD K. SELLICK AND MILTON KALISCHER, OF MANSFIELD, OHIO, ASSIGNORS TO WESTINGHOUSE ELECTRIC do MANUFACTURING COMPANY, A CORPORATION 01' PENNSYLVANIA BEFBIGERATING APPARATUS Application filed May 13,

This invention relates to refrigerating apparatus and more particularly to the evaporators or cooling coils embodied 1n such apparatus. It is an object of the invention to materially increase the effective cooling surface of the evaporator without increasing the length of the coils utilized to conduct the refrigerant fluid.

Another object is to eliminate the brine tank, sometimes used as a cold-storing element, and to substitute therefor a mass of metal in which the refrigerant coils are embedded.

A still further object is to provide-an evaporator comprising refrigerant coils embedded in a mass of metal, the metal serving to increase the effective cooling surface of the evaporator to protect the coils against injury and corrosion and to provide a freezin chamber for the reception of ice-trays.

ore specifically, the invention has for its object to provide a means for protecting the cooling coils whereby they may be embedded in a metal castmg at a relatively high temperature. without marring or destroying the coil.

Other objects and advantages of the 1nvention will be apparent from the following description and accompanying drawings,

wherein, a

Figure 1 is a perspective view of the refrigerant coil utilized in this invention,

Fig. 2 is a pers ective view of a complete evaporator embo ying the invention,

Fig. 3 is a vertical sectional view through the evaporator, showing the embedded 0011s, and

Fig. 4-. is an enlarged cross-sectional view of the tubing utilized in building the evaporator, and taken on line IV"IV of Fig. 1.

It has heretofore been proposed to employ quantities or masses of metal adjacent to the evaporator coils in order to dispense w1th the use of a brine tank and to increase the radiating surface of the evaporator. The general ractice has been to wrap the colls around t e outer surfaces of a metal block, the block itself being provided with a hollow portion or recess to receive an ice tray.

1829. Serial No. 382,776.

coils to dissolve in the aluminum when the latter is in its molten state. This is true even though the melting point of aluminum is 658 and that of copper is 1083 C.

Copper tubing is particularly desirable for use as the refrigerant coil because of its flexibility whereby it may readily'be formed on a mandrel and also because it is chemically inert to the refrigerants used in household niachines, for example, sulphur dioxide, ethyl chloride, methyl chloride and isobutane. Aluminum is also preferred as the encasing metal because of its relatively low specific weight and relatively high specific.

heat, as compared with other metals, and in addition, it is not corroded by exposure to the atmosphere.

This invention provides an evaporator comprising a copper coil embedded in aluminum, the coil being rotected from the destructive action of t e hot aluminum by a coating of a metal having a melting point higher than that of either copper or aluminum. We find that, bfv plating the copper tubing with a metal 0 high melting point, for example, nickel, chromium, cobalt, or an alloy of one of them that the tubing is not affected by the molten aluminum during the casting process.

Referring to the drawings, wherein is shown a preferred embodiment of the invention, 10 designates a tube, preferably of copper, which has its outer surface plated, as indicated at 11, with a metal which has a higher melting point than aluminum or copper and is chemically inert with respect to these metals. We have found that nickel may be successfully utilized for this purpose.

The plated tubing is wound on a suitable mandrel (not shown) to the desired shage, and the coil is held rigidly in position y suitable clamping strips 12, arranged in pairs at suitable intervals around the coil; screws 13 are located between the turns of the coil to retain the individual pairs of clamping strips rigidly in place. The ends of the coil project vertically upward, as indicated at 14: and 15, to serve as a' means for connecting the evaporator to the refrigerant circulatory system.

After the coil has been formed and braced, it is inserted in a suitable mold (not shown) and the molten aluminum is poured about it. The mold may be of such a shape as to provide heat-dissipating fins 16 on the vertical surfaces of the evaporator and also to provide a recess or freezing compartment 17 having molded ledges 18 on its opposite vertical walls for receiving ice trays.

The open end of the evaporator may be provided with a door 19 to further increase the effectiveness of the freezing compartment.

While we have described a cast evaporator having a coil of copper embedded in an aluminum casting, it will be apparent that our invention may be applied to any castmetal evaporator in which there is a tendency for the metals of the coil and the casting tc absorb each other when heated, or in which it is desired to form the coil and the casting of the same metal, it being merely necessary in any case, to protect the tube b a coating of a metal having a higher melting P0111; than the metal or metals comprising the elements of the evaporator and which is, ar. the same time, chemically inert to these metals.

Although We have shown and described specific embodiment of our invention, it Will be apparent that other forms might be adopted, all coming within the scope of the appended claims.

We claim as our invention:

1. A cooling unit for a mechanical refrigerating system comprising a plated copper coil embedded in an aluminum casting.

2. A cooling unit for a mechanical refrig crating apparatus comprising a coiled copper tube having a plated outer surface and an aluminum mass encasing said coil.

3. A cooling unit for a mechanical refrigerating apparatus comprising a refrigerant conveying element, a metallic coating on the outer surfaces of said element and a metallic mass encasing the element, said metallic coating being formed of a metal having a higher melting point than either of the metals forming the element and the encasing mass.

4;. A coolingunit for refrigerating apparatus comprising a plated copper refrigerant-conveying element embedded in an aluminum casting.

5. A cooling unit for refrigerating appa- HAROLD K. SELLICK. MILTON KALISOHER.

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