Structure of vertical 2 piston Stirling engine


The vertical 2 piston Stirling engine is alpha type Stirling engine produced for experiment as the engine of comparative small output. Cylinders on both of expansion side and compression side are arranged by erection on clankcasing, and a heater and cooler are arranged by upper part of each cylinder. Expansion space and compression space formed by these components are connected by a regenerator case and become very compact layout. The bore and stroke of pistons are both 50 mm, and these pistons are connected cranks refered cross heads. Both crank shaft and output shaft are connected by a clank of a triangular shape that is unique mechanism. The crank case of this engine is able to use as buffer space. In each power piston 1-way piston ring is used, then minimum pressure in engine increase to close buffer pressure, and be able to make output of an engine improve.

Engine Specifications
Engine typeAlfa type
Power piston of Expansion SideBore50mm
Swept Volme98.17cc
Power piston of Compression SideBore50mm
Swept Volme98.17cc
Drive MechanismThree Parallel Crank and Coupling Rods
Phase Angle90degree

Characteristics and structure of heat exchangers

A heat exchanger is arranged by a gate form by a heater, regenerator, cooler. For the heater, The form is choosen that Block Bored Meny Holes insert to the shell of stainless steel made, considering erectric heat wire heating. For the cooler, shell and tubes type is adopted, and working gas pass through pipe inside, and outside of pipe, cooling water pass. The regenerator adopt a form to pile up many nets of stainless steel made.

Heat Exchanger Specifications
TypeBlock Bored Many Holes
Number of Holes108
Diameter of Holes/td>2mm
Length of Holes50mm
TypeShell and Tubes
Number of Tubes97
Inner Diameter of Tubes3mm
Length of Tubes51mm
RegeneratorTypeWire Sheets Laminated
MaterialStainless Steel Wire Cloth
Number of Sheets276

The driven Mechanism

A driving mechanism of the engine is the shape to join three parallel clanks like a figure. At this figure, the length of crank 14, 25 and 36 are equal. And length of Connecting rod 45, 56 and 64 are mutually equal to distance of crank shaft 12, 23, 31. Therefore the motion of crank 1 is linked up with crank2 and crank 3 as the rotatory motion with no dead point. For this mechanism, a loss of a mechanism itself is very little, and by adopting this mechanism, it is able that the size of engine include Fry wheel makes to very compact becouse the output shaft is located center of the engine.

The performance of vertical 2 Piston Stirling Engine

Vertical 2 Piston Stirling Engine [NSE]

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