# US 2018/0320978 A1 · Heat exchanger and method for manufacturing plate-shaped fins for heat exchanger

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- Number: US 2018/0320978 A1
- Document ID: US20180320978A1
- Status: Published application
- Kind: A1
- Application number: 16/026,528
- Filed: 2018-07-03
- Published: 2018-11-08
- Earliest claimed: 2017-02-16
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Shin Nakamura; Akira Ishibashi; Shinya Higashiiue; Daisuke Ito; Shigeyoshi Matsui; Yuki Ugajin; Takashi Okazaki; Atsushi Mochizuki
- Web page: https://patentgrep.com/patent/US20180320978A1

## CPC

- F28D 1/053: the conduits being straight
- B21D 53/08: of both metal tubes and sheet metal (connecting tubes in openings B21D39/06)
- F25B 39/00: Evaporators; Condensers
- F28F 1/32: the means having portions engaging further tubular elements
- Y02B 30/00: Energy efficient heating, ventilation or air conditioning [HVAC]
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

Plate-shaped fins of a heat exchanger each include, at circumferential portions thereof defining a notch in which a heat transfer tube having a flattened shape is disposed, fin collars formed by being raised from the circumferential portions. Each of the fin collars includes, in a position that faces a long axis side surface of the heat transfer tube, at least one reflare section bent in a direction opposite to the side surface. At least one of the reflare sections defining fin pitches between the adjoining plate-shaped fins is formed so that a reflare tip portion, which is a tip portion of the reflare section, is drawn apart from a contact side surface of the plate-shaped fin with which the reflare section comes into contact.

## Claims

### Claim at position 1

1-13. (canceled)

### Claim 14

A heat exchanger comprising:
a plurality of plate-shaped fins arranged at predetermined fin pitches, each of the plate-shaped fins being provided with an opening; and
a heat transfer tube having a flattened shape and disposed in the opening,
each of the plurality of plate-shaped fins including, at circumferential portions thereof defining the opening, raised portions being in contact with the heat transfer tube,
each of the raised portions including a plurality of first portions that are in contact with an adjoining one of the plurality of plate-shaped fins,
the heat transfer tube having a first end portion that is one end of a flat-cross section in a longitudinal direction and a second end portion that is an other end of the flat-cross section in the longitudinal direction,
the plurality of first portions being provided along the longitudinal direction of the flat-cross section in positions that face each of both side surfaces of the heat transfer tube,
in the longitudinal direction, a distance between the first end portion and one of the plurality of first portions that is closest to the first end portion being different from a distance between the second end portion and another one of the plurality of first portions that is closest to the second end portion.

### Claim 15 (depends on 14)

The heat exchanger of claim 14, wherein the number of the plurality of first portions provided in positions that face one of the both side surfaces of the heat transfer tube differs from the number of the plurality of first portions provided in positions that face an other of the both side surfaces of the heat transfer tube.

### Claim 16 (depends on 14)

The heat exchanger of claim 14, wherein three or more of the plurality of first portions are provided in positions that face one of the both side surfaces of the heat transfer tube.

### Claim 17 (depends on 14)

The heat exchanger of claim 14, wherein at least one of the plurality of first portions has a part being in contact with the adjoining one of the plurality of plate-shaped fins and a part being apart from the adjoining one of the plurality of plate-shaped fins.