# US 5,349,131 A · Electrical wiring material and transformer

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- Number: US 5,349,131 A
- Document ID: US5349131A
- Status: Granted
- Kind: A
- Application number: 07/906,375
- Filed: 1992-06-30
- Granted: 1994-09-20
- Earliest claimed: 1992-06-30
- Assignees: Furukawa Electric Co., Ltd.
- Inventors: Junji Sotani; Kuniyoshi Satoh; Hajima Noda
- Web page: https://patentgrep.com/patent/US5349131A

## CPC

- H01F 27/18: by evaporating liquids
- Y10T 29/49179: by metal fusion bonding
- Y10T 29/49181: by deforming
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An electrical wiring material having a cooling function is characterized by a long hollow conductive body within which operating fluid is internally confined. An electrical connection piece is provided at the end portions of the conductive body, or other portions thereof. When used to wire electronic apparatuses, resulting heat is radiated due to evaporation and condensation of the operating fluid within the hollow conductive body. The wiring material may be used to wind a transformer, particularly the low voltage side, to provide a self cooling transformer.

## Claims

### Claim 1

An electrical wiring material, comprising:
a hollow conductive body having an elongated length;
an operating fluid confined within said hollow conductive body;
said hollow conductive body being deformed at at least one location along said length therewith to define in said hollow conductive body a flattened electrical connection piece at said at least one location; and
a remainder of said hollow conductive body including at least one hollow segment, said at least one hollow segment being bounded on at least one side by said electrical connection piece.

### Claim 2 (depends on 1)

The electrical wiring material according to claim 1, wherein said electrical connection piece has at least one of bifurcated, annular, cylindrical and channel-like shape.

### Claim 3 (depends on 1)

The electrical wiring material according to claim 1, wherein said at least one electrical connection piece is disposed at each of opposite ends of said hollow conductive body.

### Claim 4 (depends on 3)

The electrical wiring material according to claim 3, wherein said electrical connection piece includes means for confining said operating fluid within said hollow conductive body.

### Claim 5 (depends on 1)

The electrical wiring material according to claim 1, wherein said hollow conductive body has an external insulating means disposed at least partially along said length and around said at least one remaining hollow segment.

### Claim 6 (depends on 1)

The electrical wiring material according to claim 1, wherein a substantial portion of said at least one hollow segment has at least one of a square, rectangular, circular and elliptical cross-sectional shape.

### Claim 7 (depends on 1)

The electrical wiring material according to claim 1, wherein a radiation plate is disposed at a position along said at least one hollow segment.

### Claim 8 (depends on 1)

The electrical wiring material according to claim 1, further comprising:
a wick disposed within said hollow conductive body.

### Claim 9

A transformer, comprising:
a hollow conductive body having an elongated length;
an operating fluid confined within said hollow conductive body;
said transformer including a low voltage side wound with said hollow conductive body.

### Claim 10 (depends on 9)

The transformer according to claim 9, wherein said conductive body has an external insulating means disposed at least partially along said length and around said at least one remaining hollow segment.

### Claim 11

A transformer, comprising:
a hollow conductive body having an elongated length;
an operating fluid confined within said hollow conductive body;
said hollow conductive body being deformed at at least one location along said length therewith to define in said hollow conductive body a flattened electrical connection piece at said at least one location; and
a remainder of said hollow conductive body including at least one hollow segment, said at least one hollow segment being bounded on at least one side by said electrical connection piece.
a one portion of said at least one hollow segment being included in the windings of a low voltage side of said transformer.

### Claim 12 (depends on 11)

The transformer according to claim 11, wherein said at least one electrical connection piece is disposed at each of opposite ends of said hollow conductive body.

### Claim 13 (depends on 11)

The transformer according to claim 11, further comprising a radiation plate disposed along an unwound portion of any one of said at least one hollow segment.

### Claim 14 (depends on 11)

The transformer according to claim 11, wherein said conductive body has an external insulating means disposed at least partially along said length and around said at least one remaining hollow segment.