Heat exchanger, heat exchanger manufacturing method, and air-conditioner including heat exchanger

A heat exchanger comprising:

• a flat perforated heat transfer pipe having multiple refrigerant flow paths substantially parallel to each other;
• a fin provided with an insertion hole into which the flat perforated heat transfer pipe is to be inserted;
• and
• headers connected to ones of the refrigerant flow paths at both end portions in a width direction of the flat perforated heat transfer pipe,
• wherein the refrigerant flow paths are separated by at least four partition walls in the flat perforated heat transfer pipe, and are arranged in the width direction,
• the flat perforated heat transfer pipe is expanded and joined to the insertion hole, and
• the refrigerant flow paths arranged at both end portions in the width direction have a greater width than an average of widths of other refrigerant flow paths.

A heat exchanger comprising:

• a flat perforated heat transfer pipe having multiple refrigerant flow paths substantially parallel to each other;
• a fin provided with an insertion hole into which the flat perforated heat transfer pipe is to be inserted;
• and
• headers connected to ones of the refrigerant flow paths at both end portions in a width direction of the flat perforated heat transfer pipe,
• wherein the refrigerant flow paths are separated by at least four partition walls in the flat perforated heat transfer pipe, and are arranged in the width direction,
• the flat perforated heat transfer pipe is expanded and joined to the insertion hole, and
• one of the refrigerant flow paths arranged at a center portion in the width direction has a smaller width than an average of widths of other refrigerant flow paths.

A heat exchanger comprising:

• a flat perforated heat transfer pipe having multiple refrigerant flow paths substantially parallel to each other;
• a fin provided with an insertion hole into which the flat perforated heat transfer pipe is to be inserted;
• and
• headers connected to ones of the refrigerant flow paths at both end portions in a width direction of the flat perforated heat transfer pipe,
• wherein the refrigerant flow paths are separated by six partition walls in the flat perforated heat transfer pipe, and are arranged in the width direction,
• the flat perforated heat transfer pipe is expanded and joined to the insertion hole, and
• a width LT of each of the refrigerant flow paths arranged at both end portions in the width direction and a width LC of one of the refrigerant flow paths arranged at a center portion in the width direction satisfies a relationship of 1.0<(LT/LC)<3.5.