Air conditioner with grooved inner heat exchanger tubes and grooved outer heat exchanger tubes

Patent metadata

Field	Value
Publication number	US-9791218-B2
Application number	US-201313840271-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Nov 28, 2007
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

To increase a heat exchange capacity of an indoor heat exchanger without increasing a pressure loss inside tubes of an outdoor heat exchanger. A heat exchanger is constituted by an indoor machine equipped with an indoor heat exchanger 10 constituted by a plurality of heat transfer tubes 12 A, which have a spiral grooves 13 A formed with a predetermined lead angle Ra on inner faces of the tubes and are made to pierce a plurality of fins 11 , and an outdoor machine equipped with an outdoor heat exchanger 20 constituted by a plurality of heat transfer tubes 22 A which have a lead angle Rb of spiral grooves 23 A smaller than that of a heat transfer tubes 10 A used for the indoor heat exchanger 10 and are made to pierce a plurality of fins 11.

First claim

The invention claimed is:

1. An air conditioner, comprising:
an indoor machine equipped with an indoor heat exchanger constituted by a plurality of expanded heat transfer tubes which pierce a plurality of fins, and
an outdoor machine equipped with an outdoor heat exchanger constituted by a plurality of expanded heat transfer tubes which pierce a plurality of fins, wherein
the plurality of expanded heat transfer tubes of the indoor heat exchanger are expanded to be joined with the plurality of fins of the indoor heat exchanger and the plurality of expanded heat transfer tubes of the outdoor heat exchanger are expanded to be joined with the plurality of fins of the outdoor heat exchanger, and
an inner diameter of the plurality of expanded heat transfer tubes of one of the outdoor heat exchanger and the indoor heat exchanger, in which a larger number of threads of spiral grooves are formed, is greater than an inner diameter of the plurality of expanded heat transfer tubes of an other of the outdoor heat exchanger and the indoor heat exchanger, in which a smaller number of threads of spiral grooves are formed.

2. The air conditioner of claim 1 , wherein the plurality of expanded heat transfer tubes are formed of a metal material comprising at least one of copper, copper ahoy, aluminum or aluminum alloy.

3. The air conditioner of claim 1 , wherein R32 is used as a refrigerant.

4. The air conditioner of claim 1 , wherein R410A is used as a refrigerant.

5. The air conditioner of claim 1 , wherein R407C or carbon dioxide is used as a refrigerant.

6. The air conditioner of claim 1 , wherein
an expanded diameter of the plurality of expanded heat transfer tubes of the indoor heat exchanger is 105.5 to 106.5% of an original diameter of the plurality of expanded heat transfer tubes of the indoor heat exchanger, and
an expanded diameter of the plurality of expanded heat transfer tubes of the outdoor heat exchanger is 106 to 107.5% of an original diameter of the plurality of expanded heat transfer tubes of the outdoor heat exchanger.

7. A method for manufacturing an air conditioner including an indoor machine equipped with an indoor heat exchanger constituted by a plurality of heat transfer tubes which pierce a plurality of fins, and an outdoor machine equipped with an outdoor heat exchanger constituted by a plurality of heat transfer tubes which pierce a plurality of fins, the method comprising:
joining the plurality of heat transfer tubes and the plurality of fins of the indoor heat exchanger by expanding the plurality of heat transfer tubes; and
joining the plurality of heat transfer tubes and the plurality of fins of the outdoor heat exchanger by expanding the plurality of heat transfer tubes, wherein
an expanded diameter of the plurality of heat transfer tubes of one of the outdoor heat exchanger and the indoor heat exchanger, in which a larger number of threads of spiral grooves are formed, is greater than an expanded diameter of the plurality of heat transfer tubes of an other of the outdoor heat exchanger and the indoor heat exchanger, in which a smaller number of threads of spiral grooves are formed.

Assignees

• Lee Sangmu
• Mitsubishi Electric Corp

Inventors

• Lee Sangmu

Classifications

• F28F1/42

  the means being both outside and inside the tubular element · CPC title

• F25B2500/01

  Geometry problems, e.g. for reducing size · CPC title

• F28F1/32

  the means having portions engaging further tubular elements · CPC title

• F25B39/00

  Evaporators; Condensers · CPC title

• F28F1/422

  with outside means integral with the tubular element and inside means integral with the tubular element (F28F1/424 takes precedence) · CPC title