# US 2019/0170457 A1 · Fixing device for double sided heat sink and associated heat dissipating system

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- Number: US 2019/0170457 A1
- Document ID: US20190170457A1
- Status: Published application
- Kind: A1
- Application number: 16/172,081
- Filed: 2018-10-26
- Published: 2019-06-06
- Earliest claimed: 2017-10-27
- Assignees: EMC IP Holding Company LLC
- Applicants: EMC IP Holding Company LLC
- Inventors: Haifang Zhai; Hendry Wu; David Dong; Yujie Zhou
- Web page: https://patentgrep.com/patent/US20190170457A1

## CPC

- F28F 19/002: {by using inserts or attachments}
- F28D 15/0266: {with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers (F28D15/043 takes precedence)}
- F28D 15/0275: {Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores}
- H05K 1/0203: {Cooling of mounted components (H05K1/0272 takes precedence)}
- H05K 1/18: structurally associated with non-printed electric components (H05K1/16 takes precedence)
- H05K 7/20154: {Heat dissipaters coupled to components}
- H05K 7/20336: {Heat pipes, e.g. wicks or capillary pumps}
- H05K 7/2039: {characterised by the heat transfer by conduction from the heat generating element to a dissipating body (arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00)}
- H05K 7/205: {Heat-dissipating body thermally connected to heat generating element via thermal paths through printed circuit board [PCB] (details of PCBs relating to heat transfer H05K1/0201)}
- H05K 7/20809: {within server blades for removing heat from heat source}
- H10W 40/611: {Bolts or screws}
- H10W 40/73: for cooling by change of state
- F28F 2265/30: for preventing vibrations
- F28F 2280/02: Removable elements
- H05K 2201/064: Fluid cooling, e.g. by integral pipes
- H05K 2201/066: Heatsink mounted on the surface of the printed circuit board [PCB]
- H10W 40/231: {characterised by their places of attachment or cooling paths}
- H10W 40/235: {attached to package parts}
- H10W 40/60: Securing means for detachable heating or cooling arrangements, e.g. clamps
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)
- 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)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

Embodiments of the present disclosure relate to a fixing device for a double-sided heat sink and an associated heat dissipating system. There is exemplarily provided a fixing device for mounting the double-sided heat sink on a carrier, The fixing device comprises: a first holder including a first cylindrically-shaped rod, wherein the first cylindrically-shaped rod can pass through a first cooling portion of the double-sided heat sink and a mounting hole of the carrier to fix the first cooling portion to a first side of the carrier, and the first cylindrically-shaped rod comprises a through-hole extending along a longitudinal direction; and a second holder including a second cylindrically-shaped rod, wherein the second cylindrically-shaped rod can pass through a mounting hole of a second cooling portion of the double-sided heat sink and the through-hole of the first holder, such that the second holder is coupled with the first holder to fix the second cooling portion to a second side of the carrier opposite to the first side.

## Claims

### Claim 1

A fixing device (100) for mounting a double-sided heat sink (200) on a carrier (300), comprising:
a first holder (110) comprising a first cylindrically-shaped rod (111), wherein the first cylindrically-shaped rod (111) can pass through a first cooling portion (210) of the double-sided heat sink (200) and a mounting hole of the carrier (300) to fix the first cooling portion (210) to a first side (310) of the carrier (300), and the first cylindrically-shaped rod (111) comprises a through-hole (112) extending along a longitudinal direction (z); and
a second holder (120) comprising a second cylindrically-shaped rod (121), wherein the second cylindrically-shaped rod (121) can pass through a mounting hole of a second cooling portion (220) of the double-sided heat sink (200) and the through-hole (112) of the first holder (110), such that the second holder (120) is coupled with the first holder (110) to fix the second cooling portion (220) to a second side (320) of the carrier (300) opposite to the first side (310).

### Claim 2 (depends on 1)

The fixing device (100) according to claim 1, wherein the first holder (110) comprises:
a first flexible latch (113) located at a first end (116) of the first cylindrically-shaped rod (111), the first flexible latch (113) being arranged to pass through the first cooling portion (210) and the mounting hole of the carrier (300) from the first side (310) of the carrier (300) to fix the first end (116) of the first holder (110) to the second side (320) of the carrier (300).

### Claim 3 (depends on 2)

The fixing device (100) according to claim 2, wherein the first holder (110) comprises:
a first flange (114) located at a second end (117) of the first cylindrically-shaped rod (111), the first flange (114) being arranged to limit the first cooling portion (210) in the longitudinal direction (z).

### Claim 4 (depends on 2)

The fixing device (100) according to claim 2, wherein the first holder (110) comprises:
a protrusion (115) adjoining the first flexible latch (113), the protrusion (115) being arranged to define a gap between the second cooling portion (220) and the second side (320) of the carrier (300).

### Claim 5 (depends on 3)

The fixing device (100) according to claim 3, further comprising:
a cylindrically-shaped spring (130) arranged between the first flange (114) and the first flexible latch (113).

### Claim 6 (depends on 1)

The fixing device (100) according to claim 1, wherein the second holder (120) comprises:
a second flexible latch (122) located at a first end (124) of the second cylindrically-shaped rod (121), the second flexible latch (122) being arranged to pass through the mounting hole of the second cooling portion (220) and the through-hole (112) of the first holder (110) from the second side (320) of the carrier (300) to couple the first end (124) of the second holder (120) to the second end (117) of the first holder (110).

### Claim 7 (depends on 6)

The fixing device (100) according to claim 6, wherein the second holder (120) comprises:
a second flange (123) located at a second end (125) of the second cylindrically-shaped rod (121), the second flange (123) being arranged to limit the second cooling portion (220) in the longitudinal direction (z).

### Claim 8 (depends on 2)

The fixing device (100) according to claim 2, wherein the first flexible latch (113) is formed in an inverted trapezoid shape.

### Claim 9 (depends on 6)

The fixing device (100) according to claim 6, wherein the second flexible latch (122) is formed in an inverted trapezoid shape.

### Claim 10

A heat dissipating system, comprising:
a double-sided heat sink (200);
a carrier (300), on which a chip (400) is arranged; and
a fixing device (100) to mount the double-sided heat sink (200) on the carrier (300),
wherein the fixing device (100) comprises:
a first holder (110) comprising a first cylindrically-shaped rod (111), wherein the first cylindrically-shaped rod (111) can pass through a first cooling portion (210) of the double-sided heat sink (200) and a mounting hole of the carrier (300) to fix the first cooling portion (210) to a first side (310) of the carrier (300), and the first cylindrically-shaped rod (111) comprises a through-hole (112) extending along a longitudinal direction (z); and
a second holder (120) comprising a second cylindrically-shaped rod (121), wherein the second cylindrically-shaped rod (121) can pass through a mounting hole of a second cooling portion (220) of the double-sided heat sink (200) and the through-hole (112) of the first holder (110), such that the second holder (120) is coupled with the first holder (110) to fix the second cooling portion (220) to a second side (320) of the carrier (300) opposite to the first side (310).
wherein the double-sided heat sink (200) comprises:
a first cooling portion (210), arranged at a first side (310) of the carrier (300) and connectable to the chip (400);
a second cooling portion (220), arranged at a second side (320) of the carrier (300) opposite to the first side (310); and
a heat pipe (230), through which the first cooling portion (210) and the second cooling portion (220) are connected to perform heat transfer.