Blind Mating Heat Relay for Optical Modules
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Solution Overview
Problem
Pluggable optical modules in telecommunication systems face operational issues due to overheating, as conventional heat pipe assemblies are typically soldered and require precise mounting, limiting heat dispersal and causing potential failures.
Innovation Solution
A blind mating heat relay system that includes a linecard with a midplane heat pipe and radiator, along with removable heat pipes and thermally conductive contact slugs, allowing for efficient heat transfer from pluggable optical modules to a main chassis while maintaining hot-swappability and accommodating limited space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional soldered heat pipe assemblies are used, then heat transfer efficiency is improved, but device complexity and manufacturing precision requirements increase
Solution Approach 1:
The heat pipe assembly is segmented into separate components: a heat pipe portion that contacts the optical module and a radiator portion that dissipates heat. These segments connect through a blind mating interface, allowing independent positioning and assembly while maintaining effective thermal coupling without complex soldering procedures.
Solution Approach 2:
A blind mating interface acts as an intermediary between the heat pipe portion and radiator portion. This interface includes a contact slug with a blind hole that receives the heat pipe, creating a simple mechanical and thermal connection that eliminates the need for precise soldered mounting while maintaining heat transfer efficiency.
2Temperature
If precise mounting is required for heat pipes, then heat transfer performance is improved, but ease of manufacture and assembly deteriorate
Solution Approach 1:
By dividing the heat pipe system into separate portions that connect via blind mating, the system eliminates the need for precise mounting of a single integrated heat pipe. Each portion can be manufactured and assembled independently with standard tolerances, significantly improving ease of manufacture and assembly.
Solution Approach 2:
Instead of requiring the heat pipe to be precisely mounted to the optical module and then to the radiator, the design inverts the approach by using a blind mating interface where the radiator portion is mounted to the circuit board first, and the heat pipe portion is then inserted into the blind hole. This reverses the assembly sequence and eliminates precise mounting requirements.
3Volume of moving object
If heat dispersal space is limited, then device compactness is improved, but heat dissipation effectiveness deteriorates
Solution Approach 1:
The heat pipe portion extends vertically from the optical module through the circuit board to the radiator portion, utilizing the vertical dimension for heat transfer. This allows effective heat dissipation within a compact horizontal footprint, as the heat path extends in the vertical direction rather than requiring additional horizontal space.
Solution Approach 2:
The heat pipe portion is inserted into the blind hole of the contact slug, creating a nested configuration where the heat pipe is contained within the receiver housing structure. This nesting allows the heat transfer components to be integrated within the existing circuit board assembly without requiring additional external space.
4Adaptability or versatility
If hot-swappable optical modules are used, then adaptability is improved, but heat management complexity increases
Solution Approach 1:
The separable heat pipe assembly mirrors the hot-swappable nature of the optical modules. The heat pipe portion can be independently attached or detached with the optical module, while the radiator portion remains fixed to the circuit board. This segmentation simplifies heat management for hot-swappable modules by providing a clear thermal path that is automatically established when the module is inserted.
Solution Approach 2:
The blind mating interface automatically establishes thermal contact when the optical module with its heat pipe is inserted into the receiver housing. The contact slug's blind hole self-aligns and receives the heat pipe portion, creating the thermal path without requiring additional adjustment or intervention, thus simplifying heat management for hot-swappable operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively disperses heat from pluggable optical modules and linecards, preventing overheating and ensuring continuous operation, even during power-on conditions, by utilizing a modular and thermally efficient heat transfer mechanism.
Implementation Method 1
a second heat pipe (18) having a cross section with a substantially rectangular shape and a pluggable optical module portion (150) contacting the first pluggable optical module (16), and a plug portion (152) removably positioned within the slot (62) of the receiver housing (60), the plug portion being in thermal contact with the first contact slug (64)
Implementation Method 2
a radiator (46) attached to the circuit board (30) and in thermal contact with the midplane heat pipe (42)
Implementation Method 3
a radiator (46) attached to the circuit board (30) and in thermal contact with the midplane heat pipe (42)
Implementation Method 4
a contact slug (64) connected to the receiver housing (60) and in thermal contact with the midplane heat pipe (42), the contact slug (64) composed of thermally conductive material
Data Source
AI summary
An optical module blind mating heat relay system, comprising a linecard comprising a circuit board; a heat relay apparatus comprising a first heat pipe on the circuit board, a radiator attached to the circuit board and in thermal contact with the first heat pipe; a heat relay receiver assembly comprising a receiver housing having a slot and a contact slug connected to the receiver housing and in thermal contact with the first heat pipe; a pluggable optical module removably engaged with the linecard; and a second heat pipe having a pluggable optical module portion contacting the pluggable optical module and having a plug portion removably positioned within the slot of the receiver housing, the plug portion in thermal contact with the contact slug, the second heat pipe removable from the receiver housing while the linecard is receiving electrical power.