# US 10,307,874 B2 · Method for sealing a heat transfer unit

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- Number: US 10,307,874 B2
- Document ID: US10307874B2
- Status: Granted
- Kind: B2
- Application number: 14/590,926
- Filed: 2015-01-06
- Published: 2016-07-07
- Granted: 2019-06-04
- Earliest claimed: 2015-01-06
- Assignees: Asia Vital Components Co., Ltd.
- Applicants: Asia Vital Components Co., Ltd.
- Inventors: Hsiu-Wei Yang
- Web page: https://patentgrep.com/patent/US10307874B2

## CPC

- B23P 15/26: heat exchangers {or the like (making heat exchangers by methods covered by other subclasses B21D53/02)}
- F28D 15/0283: {Means for filling or sealing heat pipes}
- F28D 15/04: with tubes having a capillary structure
- H10W 40/037: {Assembling together parts thereof}
- B23P 2700/09: Heat pipes
- F28F 2255/00: Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
- F28F 2275/06: by welding
- H10W 40/73: for cooling by change of state
- 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)
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)

## Abstract

The present invention relates to a method for sealing a heat transfer unit, which includes the steps of providing a heat transfer unit having at least one opening, welding the opening to form a welding section and close the opening, and pinching off the welding section and cutting part of the welding section to form a cutting end and complete sealing the opening of the heat transfer unit. By means of the method of the present invention, an extremely short dead zone can be obtained and high heat conduction efficiency is enhanced, further having the effects of reducing the arrangement space and shrinking steps of the heat pipe.

## Claims

### Claim 1

A method for sealing a heat pipe, including the steps of:
providing a heat pipe having a chamber and two openings formed at two ends of the heat pipe, wherein an inner wall of the chamber forms at least one wick structure, wherein the heat pipe is provided with a dead zone at a location of each opening, and the wick structure extends up to but is not contained in the dead zone;
pressing and welding the openings to form a welding section along the dead zone and close the openings;
pinching off part of the welding section using pinch-off equipment, and cutting off part of the welding section at a pinch-off location of the welding section, thereby reducing the length of the dead zone but not affecting the wick structure which remains extending through the heat pipe, and wherein pinching off part of the welding section forms a cutting end, and completely sealing the opening of the cutting end of the heat pipe, and the length of the dead zone being reduced to improve a heat conduction efficiency of the heat pipe.

### Claim 2 (depends on 1)

The method for sealing the heat transfer unit according to claim 1, wherein the step of welding is performed by ultrasonic welding.