# US 2009/0260790 A1 · Metal tubes for heat pipes and method of manufacturing the same

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- Number: US 2009/0260790 A1
- Document ID: US20090260790A1
- Status: Published application
- Kind: A1
- Application number: 12/106,411
- Filed: 2008-04-21
- Published: 2009-10-22
- Earliest claimed: 2008-04-21
- Inventors: Cheng-Tu WANG; Pang-Hung LIAO; Kuo-Feng TSENG
- Web page: https://patentgrep.com/patent/US20090260790A1

## CPC

- B23P 15/26: heat exchangers {or the like (making heat exchangers by methods covered by other subclasses B21D53/02)}
- F28D 15/0233: {the conduits having a particular shape, e.g. non-circular cross-section, annular (F28D15/0241, F28D15/0266 take precedence)}
- F28D 15/025: {having non-capillary condensate return means}
- F28F 1/00: Tubular elements; Assemblies of tubular elements (specially adapted for movement F28F5/00)
- F28F 21/085: {from copper or copper alloys}
- H10W 40/73: for cooling by change of state
- B23P 2700/09: Heat pipes
- F28F 2255/16: extruded
- Y10T 29/49391: Tube making or reforming
- B23P: METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS (arrangements for copying or controlling B23Q)
- 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)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In metal tubes for heat pipes and a method of manufacturing the metal tubes, a metal tube includes a tube defining an inner space, and at least one dividing portion extruding from an inner sidewall of the metal tube. The at least one dividing portion divides the inner space into a vapor channel and a liquid channel connected to the vapor channel. The metal tubes can prevent heat pipe form being dried out and improve heat dissipation efficiency of heat pipes.

## Claims

### Claim 1

A metal tube for heat pipes, comprising:
a tube defining an inner space;
at least one dividing portion extruding from an inner sidewall,
wherein the at least one dividing portion divides the inner space into a vapor channel and a liquid channel connected to the vapor channel.

### Claim 2 (depends on 1)

The metal tube for heat pipes as claimed in claim 1, wherein the tube is made of copper.

### Claim 3 (depends on 1)

The metal tube for heat pipes as claimed in claim 1, wherein the dividing portion extrudes from the inner sidewall erectly, and an end surface of the dividing portion adjoins the inner sidewall.

### Claim 4 (depends on 1)

The metal tube for heat pipes as claimed in claim 1, wherein two dividing portions extrude from the inner sidewall, the two dividing portions are arc shaped, and an end surface of each of the two dividing portions adjoins with each other.

### Claim 5 (depends on 1)

The metal tube for heat pipes as claimed in claim 1, wherein two dividing portions extrude from the inner sidewall erectly, and an end surface of each of the two dividing portions adjoins with each other.

### Claim 6 (depends on 1)

The metal tube for heat pipes as claimed in claim 1, wherein a length of the liquid channel is less than that of the vapor channel, and two connecting sections are provided at two ends of the vapor channel respectively.

### Claim 7

A method of manufacturing a metal tube for heat pipes, comprising:
a) providing a tube, a number of dividing portions extruding from an inner sidewall of the tube;
b) applying a pressure onto the dividing portions using a tool such that end surfaces thereof are adjoined with each other thereby defining a vapor channel and a liquid channel in an inner space of the tube.

### Claim 8 (depends on 7)

The method as claimed in claim 7, wherein the dividing portions are arc shaped.

### Claim 9 (depends on 7)

The method as claimed in claim 7, further comprising: c) forming a connecting section in each of two ends of the tube using a cutter.

### Claim 10 (depends on 9)

The method as claimed in claim 9, wherein the step c) is performed prior to the step b).

### Claim 11 (depends on 9)

The method as claimed in claim 9, wherein the step c) is performed after the step b).

### Claim 12

A method of manufacturing a metal tube for heat pipes, comprising:
a) providing a tube, at least one dividing portion extruding from an inner sidewall of the tube;
b′) applying a pressure onto the tube such that an end surface of the dividing portion adjoins an inner sidewall of the tube thereby defining a vapor channel and a liquid channel in an inner space of the tube.

### Claim 13 (depends on 12)

The method as claimed in claim 12, wherein the dividing portion extrudes from the inner sidewall erectly.

### Claim 14 (depends on 12)

The method as claimed in claim 12, further comprising: c) forming a connecting section in two ends of the tube using a cutter.

### Claim 15 (depends on 12)

The method as claimed in claim 12, wherein the step c) is performed prior to the step b′).
The method as claimed in claim 12, wherein the step c) is performed after the step b′).