Heat exchange tube, processing method for same, and heat exchanger having same

A heat exchanger comprising two headers arranged in parallel and spaced apart, between which a plurality of heat exchange tubes are arranged, with a width direction of the heat exchange tubes being parallel to a length direction of the headers, wherein each of the plurality of heat exchange tubes comprises:

• a body portion including a plurality of flow channels arranged in parallel and spaced apart from each other, a length direction of the flow channels being parallel to a length direction of the body portion;
• and
• an extension portion extending from at least one side of the body portion along a width direction of the body portion,
• wherein the extension portion and at least a part of the body portion are formed by folding a same plate material,
• wherein the plurality of heat exchange tubes are in communication with the two headers through the body portion,
• wherein the extension portion comprises two stacked plate material portions, outer ends of the two stacked plate material portions join together, an inner end of one of the two stacked plate material portions joins a bottom wall of the body portion, and an inner end of the other of the two stacked plate material portions joins a side wall of the body portion, and
• wherein the body portion and the extension portion of the respective heat exchange tube are an integral structure.

A processing method for a heat exchange tube, comprising:

• preparing a plate-shaped piece;
• and
• bending a left end section of the plate-shaped piece multiple times to form a left through groove section having a plurality of through grooves, with openings of two adjacent through grooves of the left through groove section facing in opposite directions, and bending a right end section of the plate-shaped piece multiple times to form a right through groove section having a plurality of through grooves, with openings of two adjacent through grooves of the right through groove section facing in opposite directions, such that a middle plate-shaped section is disposed between the left through groove section and the right through groove section, a left plate section is disposed on a left side of the left through groove section, and a right plate section is disposed on a right side of the right through groove section;
• folding the left plate section toward the middle plate-shaped section, such that the left through groove section overlaps the left plate section, and a part of the left plate section blocks two or more through groove openings of the left through groove section, and folding the right plate section toward the middle plate-shaped section, such that the right through groove section overlaps the right plate section, and a part of the right plate section blocks two or more through groove openings of the right through groove section;
• refolding the left through groove section and the left plate section that overlap with each other toward the middle plate section, such that the left through groove section overlaps the middle plate section, a part of the middle plate section blocks remaining through groove openings of the left through groove section, and a part of the left plate section that does not overlap the left through groove section forms a left extension portion;
• and
• refolding the right through groove section and the right plate section that overlap with each other toward the middle plate section, such that the right through groove section overlaps the middle plate section, a part of the middle plate section blocks remaining through groove openings of the right through groove section, and a part of the right plate section that does not overlap the right through groove section forms a right extension portion, wherein
• after the folding, a right end of the left through groove section is adjacent to a left end of the right through groove section.

A processing method for a heat exchange tube, comprising:

• preparing a plate-shaped piece;
• and
• folding a first plate section of the plate-shaped piece into a tube body having a cavity enclosed by two opposite bottom walls and two opposite side walls, wherein a second plate section of the plate-shaped piece forms an extension portion on at least one side of the tube body, and the extension portion joins one bottom wall of the tube body,
• wherein when the first plate section of the plate-shaped piece is folded into the tube body, a part of the first plate section is bent to form an inner baffle separating the cavity into a plurality of flow channels,
• wherein a partial plate section on a left side of the plate-shaped piece is bent multiple times to form a left through groove section with a plurality of through grooves, the through groove of the left through groove section has an opening on one side in a thickness direction of the tube body, openings of two adjacent through grooves of the left through groove section face in opposite directions, and a left plate-shaped section of a specified length is disposed on a left side of the left through groove section;
• wherein a partial plate section on a right side of the plate-shaped piece is bent multiple times to form a right through groove section with a plurality of through grooves, the through groove of the right through groove section has an opening on one side in the thickness direction of the tube body, openings of two adjacent through grooves of the right through groove section face in opposite directions, and a right plate-shaped section of a specified length is disposed on a right side of the right through groove section,
• wherein a middle plate-shaped section of a preset length is disposed between the left through groove section and the right through groove section,
• wherein the left plate-shaped section and the right plate-shaped section are folded toward each other, such that a part of the left plate-shaped section covers the through grooves of the left through groove section and overlaps the middle plate-shaped section, and a part of the right plate-shaped section covers the through grooves of the right through groove section and overlaps the middle plate-shaped section,
• wherein a left part of the middle plate-shaped section is bent downward, such that the left plate-shaped section and the left through groove section that overlap with each other are bent together downward, and after the bending, a part of the left plate-shaped section is located above the middle plate-shaped section, and a right part of the middle plate-shaped section is bent downward, such that the right plate-shaped section and the right through groove section that overlap with each other are bent together downward, and after the bending, a part of the right plate-shaped section is located above the middle plate-shaped section, and
• wherein the left plate-shaped section and the left through groove section that overlap with each other are then bent inward to overlap a left part of an unbent middle plate-shaped section, the right plate-shaped section and the right through groove section that overlap with each other are then bent inward to overlap a right part of the unbent middle plate-shaped section, and after the bending, a right end of the left through groove section is adjacent to a left end of the right through groove section.