Method of making heat exchanger

Claim 1

A method of making fluid-tight serpentine tubing for a heat exchanger comprising the steps of a. providing at least two upper inverted U-shaped tubing sections, b. providing at least one lower U-shaped tubing section having opposite ends adapted to telescopically fit into the ends of the upper sections, c. providing angularly spaced radial projections on the upper tubing sections or the lower tubing section adjacent the ends thereof for frictionally retaining the sections assembled together in telescopic joints while permitting the flow of solder into the joints, d. providing an aperture in at least one of the upper tubing sections above the lower ends thereof, e. assembling the lower tubing section with the ends thereof frictionally retained in the adjacent ends of the upper tubing sections, and f. dipping the lower end of the assembly into solder to immerse the lower ends of the upper tubes to a depth just below the upper ends of the lower tubing section to flow solder into the telescopic joints while venting the tubing through the aperture in the upper tube.

Claim 2

A method of making fluid-tight serpentine tubing for a heat exchanger comprising the steps of a. providing at least two upper inverted U-shaped tubing sections, b. providing at least one lower U-shaped tubing section having opposite ends adapted to telescopically fit into the ends of the upper sections, c. providing angularly spaced radial projections on the upper tubing sections or the lower tubing section adjacent the ends thereof for frictionally retaining the sections assembled together in telescopic joints while permitting the flow of solder into the joints, d. providing an aperture in at least one of the upper tubing sections above the lower ends thereof, e. assembling the lower tubing section with the ends thereof frictionally retained in the adjacent ends of the upper tubing sections, and f. dipping the lower end of the assembly into solder to immerse the lower ends of the upper tubes to a depth just below the upper ends of the lower tubing section to flow solder into the telescopic joints while venting the tubing through the aperture in the upper tube.

Claim 5

A method of making a heat exchanger with fluid-tight serpentine aluminum tubing for liquid refrigerant and aluminum heat transfer fins on the tubing, comprising the steps of; a. providing long U-shaped aluminum tubing sections for supporting aluminum fins, b. providing apertured aluminum fins and stacking the fins in spaced relation on the long sections with the legs of the long sections in the apertures in the fins, c. providing short U-shaped aluminum tubing sections each having opposite ends adapted to telescopically fit in the ends of the long sections of tubing to connect adjacent ends of the long sections, d. providing angularly spaced radial projections on the upper tubing sections or the lower tubing sections adjacent the ends thereof for frictionally retaining the sections assembled together in telescopic joints while permitting the flow of solder into the joints, e. providing an aperture in at least one of the upper tubing sections adjacent the bend therein, f. assembling the lower tubing section with the ends thereof frictionally retained in the adjacent ends of the upper tubing sections, g. dipping the lower end of the assembly into solder to immerse the lower ends of the upper tubes to a depth just below the upper ends of the lower tubing section to flow solder into the telescopic joints while venting the tubing through the aperture in the upper tube, and h. introducing ultrasonic vibrations into the solder while the assembly is dipped.

Claim 6

A method of making a heat exchanger with fluid-tight serpentine aluminum tubing for liquid refrigerant and aluminum heat transfer fins on the tubing, comprising the steps of; a. providing long U-shaped aluminum tubing sections for supporting aluminum fins, b. providing apertured aluminum fins and stacking the fins in spaced relation on the long sections with the legs of the long sections in the apertures in the fins, c. providing short U-shaped aluminum tubing sections each having opposite ends adapted to telescopically fit in the ends of the long sections of tubing to connect adjacent ends of the long sections, d. providing angularly spaced radial projections on the upper tubing sections or the lower tubing sections adjacent the ends thereof for frictionally retaining the sections assembled together in telescopic joints while permitting the flow of solder into the joints, e. providing an aperture in at least one of the upper tubing sections adjacent the bend therein, f. assembling the lower tubing section with the ends thereof frictionally retained in the adjacent ends of the upper tubing sections, g. dipping the lower end of the assembly into solder to immerse the lower ends of the upper tubes to a depth just below the upper ends of the lower tubing section to flow solder into the telescopic joints while venting the tubing through the aperture in the upper tube, and h. introducing ultrasonic vibrations into the solder while the assembly is dipped.

Claim 9

A method of making a heat exchanger with fluid-tight serpentine aluminum tubing for liquid refrigerant and aluminum heat transfer fins on the tubing, comprising the steps of a. providing long U-shaped aluminum tubing sections for supporting aluminum fins, b. providing apertured aluminum fins and stacking the fins in spaced relation on the long sections with the legs of the long sections in the apertures in the fins, c. providing short U-shaped aluminum tubing sections each having opposite ends adapted to telescopically fit in the ends of the long section of tubing to connect adjacent ends of the long sections, d. providing an aperture in at least one of the upper tubing sections adjacent the bend therein, e. assembling the lower tubing section with the ends thereof telescopically positioned in the lower ends of the upper tubing sections and spaced therefrom to permit the flow of solder into the telescopic joint, and f. dipping the lower end of the assembly into solder to immerse the lower ends of the upper tubes to a depth just below the upper ends of the lower tubing section to flow solder into the telescopic joints while venting the tubing through the aperture in the upper tube.

Claim 10

A method of making a heat exchanger with fluid-tight serpentine aluminum tubing for liquid refrigerant and aluminum heat transfer fins on the tubing, comprising the steps of a. providing long U-shaped aluminum tubing sections for supporting aluminum fins, b. providing apertured aluminum fins and stacking the fins in spaced relation on the long sections with the legs of the long sections in the apertures in the fins, c. providing short U-shaped aluminum tubing sections each having opposite ends adapted to telescopically fit in the ends of the long section of tubing to connect adjacent ends of the long sections, d. providing an aperture in at least one of the upper tubing sections adjacent the bend therein, e. assembling the lower tubing section with the ends thereof telescopically positioned in the lower ends of the upper tubing sections and spaced therefrom to permit the flow of solder into the telescopic joint, and f. dipping the lower end of the assembly into solder to immerse the lower ends of the upper tubes to a depth just below the upper ends of the lower tubing section to flow solder into the telescopic joints while venting the tubing through the aperture in the upper tube.

Claim 12

A method of making a heat exchanger with fluid-tight serpentine aluminum tubing for liquid refrigerant and aluminum heat transfer fins on the tubing, comprising the steps of a. providing long U-shaped aluminum tubing sections for supporting aluminum fins, b. providing apertured aluminum fins and stacking the fins in spaced relation on the long sections with the legs of the long sections in the apertures in the fins, c. expanding the tubing in the legs of the long sections to hold the fins in place, d. providing short U-shaped aluminum tubing sections each having opposite ends adapted to telescopically fit in the ends of the long sections of tubing to connect adjacent ends of the long sections, e. providing angularly spaced radial projections on the upper tubing sections or the lower tubing section adjacent the ends thereof for frictionally retaining the sections assembled together in telescopic joints while permitting the flow of solder into the joints, f. providing an aperture in at least one of the upper tubing sections adjacent the bend therein, g. assembling the lower tubing section with the ends thereof frictionally retained in the adjacent ends of the upper tubing sections, h. dipping the lower end of the assembly into solder to immerse the lower ends of the upper tubes to a depth just below the upper ends of the lower tubing section to flow solder into the telescopic joints while venting the tubing through the aperture in the upper tube, and i. introducing ultrasonic vibrations into the solder while the assembly is dipped.

Claim 13

A method of making a heat exchanger with fluid-tight serpentine aluminum tubing for liquid refrigerant and aluminum heat transfer fins on the tubing, comprising the steps of a. providing long U-shaped aluminum tubing sections for supporting aluminum fins, b. providing apertured aluminum fins and stacking the fins in spaced relation on the long sections with the legs of the long sections in the apertures in the fins, c. expanding the tubing in the legs of the long sections to hold the fins in place, d. providing short U-shaped aluminum tubing sections each having opposite ends adapted to telescopically fit in the ends of the long sections of tubing to connect adjacent ends of the long sections, e. providing angularly spaced radial projections on the upper tubing sections or the lower tubing section adjacent the ends thereof for frictionally retaining the sections assembled together in telescopic joints while permitting the flow of solder into the joints, f. providing an aperture in at least one of the upper tubing sections adjacent the bend therein, g. assembling the lower tubing section with the ends thereof frictionally retained in the adjacent ends of the upper tubing sections, h. dipping the lower end of the assembly into solder to immerse the lower ends of the upper tubes to a depth just below the upper ends of the lower tubing section to flow solder into the telescopic joints while venting the tubing through the aperture in the upper tube, and i. introducing ultrasonic vibrations into the solder while the assembly is dipped.