Heat exchanger

Patent metadata

Field	Value
Publication number	US-12247787-B2
Application number	US-202117909198-A
Country	US
Kind code	B2
Filing date	Mar 5, 2021
Priority date	Mar 24, 2020
Publication date	Mar 11, 2025
Grant date	Mar 11, 2025

Abstract

A heat exchanger includes flat heat transfer tubes and a header, wherein the header includes a first partition member that separates an internal space of a main body unit into a refrigerant inflow portion and an upper portion, a second partition member that separates the upper portion into a connected portion connected to the flat heat transfer tubes and an opposite portion, and a third partition member that separates the opposite portion into a windward portion and a leeward portion a plurality of windward communication holes allowing communication between the windward portion and the connected portion and a plurality of leeward communication holes allowing communication between the leeward portion and the connected portion are arranged in the second partition member an adjustment channel that increases a flow rate of the windward communication holes as compared to a flow rate of the leeward communication holes is arranged inside the header.

First claim

The invention claimed is:

1. A heat exchanger comprising:
a plurality of flat heat transfer tubes that are laminated such that wide surfaces face one another; and
a header that is connected to end portions of the plurality of flat heat transfer tubes, and that distributes a refrigerant to the plurality of flat heat transfer tubes, wherein
the header includes
a tubular main body unit;
a first partition member that separates an internal space of the main body unit into a refrigerant inflow portion into which the refrigerant flows and an upper portion that is located above the refrigerant inflow portion;
a second partition member that separates the upper portion into a connected portion that is connected to the plurality of flat heat transfer tubes and an opposite portion that is located opposite to the flat heat transfer tubes across the connected portion; and
a third partition member that separates the opposite portion into a windward portion and a leeward portion that is located on a leeward side of an external air flow with respect to the windward portion,

a plurality of windward communication holes and a plurality of leeward communication holes are arranged in the second partition member, the plurality of windward communication holes being aligned in a lamination direction of the plurality of flat heat transfer tubes and allowing communication between the windward portion and the connected portion, the plurality of leeward communication holes being aligned in the lamination direction of the plurality of flat heat transfer tubes and allowing communication between the leeward portion and the connected portion,
an adjustment channel is arranged inside the header, the adjustment channel allowing the refrigerant that has flown into the refrigerant inflow portion to be distributed to the windward portion and the leeward portion, and increasing a flow rate of the plurality of windward communication holes as compared to a flow rate of the plurality of leeward communication holes,
the adjustment channel includes
a windward inflow path that is arranged in the first partition member, allows communication between the refrigerant inflow portion and the windward portion, and allows the refrigerant to flow from the refrigerant inflow portion, and
a leeward inflow path that is arranged in the first partition member, allows communication between the refrigerant inflow portion and the leeward portion, and allows the refrigerant to flow from the refrigerant inflow portion, and

a cross sectional area of the windward inflow path is larger than a cross sectional area of the leeward inflow path.

2. The heat exchanger according to claim 1 , wherein the adjustment channel further includes
a communication path that is arranged in an end portion of the third partition member in the lamination direction.

3. The heat exchanger according to claim 1 , wherein the windward communication holes and the leeward communication holes are arranged for the plurality of flat heat transfer tubes that are connected to the connected portion, respectively.

4. The heat exchanger according to claim 3 , wherein the header includes a plurality of fourth partition members that separate the connected portion for the plurality of flat heat transfer tubes that are connected to the connected portion.

5. The heat exchanger according to claim 1 , wherein
the plurality of windward communication holes have different cross sectional areas, and
the plurality of leeward communication holes have different cross sectional areas.

6. The heat exchanger, according to claim 1 , wherein
the adjustment channel includes the plurality of windward communication holes and the plurality of leeward communication holes, and
a total cross sectional area of the plurality of windward communication holes is larger than a total cross sectional area of the plurality of leeward communication holes.

7. The heat exchanger according to claim 1 , wherein
the adjustment channel includes the windward portion and the leeward portion, and
a cross sectional area of the windward portion in a horizontal direction is larger than a cross sectional area of the leeward portion in the horizontal direction.

8. A heat exchanger comprising:
a plurality of flat heat transfer tubes that are laminated such that wide surfaces face one another; and
a header that is connected to end portions of the plurality of flat heat transfer tubes, and that distributes a refrigerant to the plurality of flat heat transfer tubes, wherein
the header includes
a tubular main body unit;
a first partition member that separates an internal space of the main body unit into a refrigerant inflow portion into which the refrigerant flows and an upper portion that is located above the refrigerant inflow portion;
a second partition member that separates the upper portion into a connected portion that is connected to the plurality of flat heat transfer tubes and an opposite portion that is located opposite to the flat heat transfer tubes across the connected portion; and
a third partition member that separates the opposite portion into a windward portion and a leeward portion that is located on a leeward side of an external air flow with respect to the windward portion,

a plurality of windward communication holes and a plurality of leeward communication holes are arranged in the second partition member, the plurality of windward communication holes being aligned in a lamination direction of the plurality of flat heat transfer tubes and allowing communication between the windward portion and the connected portion, the plurality of leeward communication holes being aligned in the lamination direction of the plurality of flat heat transfer tubes and allowing communication between the leeward portion and the connected portion,
an adjustment channel is arranged inside the header, the adjustment channel allowing the refrigerant that has flown into the refrigerant inflow portion to be distributed to the windward portion and the leeward portion, and increasing a flow rate of the plurality of windward communication holes as compared to a flow rate of the plurality of leeward communication holes, and
an opening area of an uppermost windward communication hole of the plurality of windward communication holes is larger than an opening area of a lowermost windward communication hole of the plurality of windward communication holes.

Assignees

• Fujitsu General Ltd

Inventors

• Nakata Shohei
• Maema Yoshinari
• Oka Kotaro

Classifications

• F25B39/028

  having distributing means · CPC title

• F28F9/0204

  for elongated header box, e.g. with transversal and longitudinal partitions · CPC title

• F28F9/22

  Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates · CPC title

• F28F9/0278

  in the form of stacked distribution plates or perforated plates arranged over end plates · CPC title

• F28F1/02

  Tubular elements of cross-section which is non-circular (F28F1/08, F28F1/10 take precedence) · CPC title