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Tri-clamp displacer head: ISO 2852 cap with Ø3 rod bore and 4 mm barb, 1.5, 2 and 3 in
What end cap guides the displacer rod out of a tri-clamp Stirling cylinder? · Hardware · basis: ISO 2852 cap face (Ø50.5 / 64.0 / 91.0 flange, 6 mm cap) with a Ø3 run bore on centre and a 4 mm hose barb
Long Earth Society build part. The displacers and heads the LES tri-clamp engines are built from. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 3 in table
Notes
- An ISO 2852 end cap with the displacer-rod guide and a transfer port on its back, so a stock clamp and Type B gasket seal it to any ferrule of its size.
- On centre: a Ø3 bore straight through cap and boss for the Ø3 displacer rod (run fit). The bore is the rod guide and the clearance seal; nothing is pressed into it.
- Off centre: an integral 4 mm hose barb (Ø6.4 base, Ø3.2 bore) for the transfer tube to the power cylinder, at 13.75 / 20.25 / 33.75 mm from the axis on the 1.5 / 2 / 3 in head.
- Flange Ø50.5 (1.5 in, also fits 1 in ferrules), Ø64.0 (2 in), Ø91.0 (3 in).
Sizes
| size_in | flange_od_mm | rod_bore_mm | barb | barb_offset_mm |
|---|---|---|---|---|
| 1.5 | 50.5 | 3 | 4 mm (Ø6.4, Ø3.2 bore) | 13.75 |
| 2 | 64.0 | 3 | 4 mm (Ø6.4, Ø3.2 bore) | 20.25 |
| 3 | 91.0 | 3 | 4 mm (Ø6.4, Ø3.2 bore) | 33.75 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| head faces | ISO 2852 | ferrule face + Type B gasket | clamp | head-* |
| transfer-port barb | Ø6.4 barb, Ø3.2 bore | 4 mm ID tube | designed | head-displacer-* |
| rod-guide bore | Ø3 × 16.4 (through cap and Ø10 boss) | Ø3 displacer rod | run | head-displacer-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Long Earth Society | Tri-clamp Stirling engine builds | web, video | LES site |
| James R. Senft | An Introduction to Low Temperature Differential Stirling Engines (displacer and gap design) | book | Moriya Press verify |
| Wikipedia | Stirling engine | web | CC BY-SA 4.0 (text) |
Free files
★ Free files 3 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| head-displacer-1.5in | 1.5 in ISO 2852 cap: Ø3 rod-guide bore straight through the cap and its Ø10 × 12 boss for the Ø3 displacer rod (running fit, see Mating features); 4 mm transfer-port barb | STEP · STL |
| head-displacer-2in | 2 in ISO 2852 cap: Ø3 rod-guide bore straight through the cap and its Ø10 × 12 boss for the Ø3 displacer rod (running fit, see Mating features); 4 mm transfer-port barb | STEP · STL |
| head-displacer-3in | 3 in ISO 2852 cap: Ø3 rod-guide bore straight through the cap and its Ø10 × 12 boss for the Ø3 displacer rod (running fit, see Mating features); 4 mm transfer-port barb | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-displacer-head
How it fits
Goes in or on
Tri-clamp spool, 1.5 and 2 inchISO 2852 face on the spool ferruleConnects to
Tri-clamp displacerØ3 rod from the displacer cap through the Ø3 bore
Silicone tube 1 × 3 to 10 × 14 mm4 mm ID tube on the transfer barb
Tri-clamp power headtransfer tube to the power cylinderAlternatives
Tri-clamp crank headrod bore plus crank towers in one headAlso needed
Tri-clamp clamp, two-boltclamp and gasket on the faceIn these build lists
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Questions
How does the displacer rod get out of a tri-clamp cylinder?
Through the Ø3 bore on the centre of this head: the Ø3 rod runs in it, and the bore length is the clearance seal.
What is the barb on the displacer head for?
The transfer port: a 4 mm barb (Ø6.4 base, Ø3.2 bore) for the tube to the power cylinder.
Does it need a special clamp?
No: the face is ISO 2852, so a stock clamp and Type B gasket for the flange size seal it.