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Burner shroud for a finned 2 in tri-clamp hot head
How do I keep a torch or burner flame on the hot end of a Stirling engine? · Hardware · basis: Design values from the sealed generator layout: shell 6 mm clear of the Ø76 fins, open bottom over the torch stand, exhaust windows under the lid; ISO 273 medium clearance (Ø4.5) for the M4 foot screws
Long Earth Society build part. The shroud that keeps the flame on my sealed generator's fins. 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
- 6 in table
Notes
- A Ø92 / Ø88 shell round the finned end of the hot head, from 15 mm below the head's bottom to 10 mm above the top fin. The bottom is open: the torch or burner below fires up into it. A lid closes the top down to Ø54.8, 2 mm clear of the tube, and six 14 × 10 windows under the lid let the gas out sideways once it has passed the fins.
- Three 8 × 8 legs stand it on the frame base; each leg's 20 × 12 × 4 foot runs outward and takes an M4 × 10 into a tapped hole in the base, clear of the leg. The shroud touches nothing else: not the head, not the fins, not the torch stand.
- The 6 mm annulus between the fins and the shell keeps the flame gas against the fins. The heat source is the builder's choice: a propane or butane torch head in the torch stand, or a natural-gas or biogas burner that fires into the open bottom.
Sizes
| feature | value |
|---|---|
| shell | Ø92 / Ø88 |
| above the base | 70 to 138.5 |
| lid opening | Ø54.8 |
| exhaust | 6 × 14 × 10 under the lid |
| legs | 3 × 8 × 8 on r 49, feet 20 × 12 × 4, Ø4.5 at r 59 |
| gap to the fins | 6.0 |
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 |
|---|---|---|---|---|
| shell bore | Ø88 | hot-head fins Ø76 (no contact) | designed | all |
| lid opening | Ø54.8 | hot-head tube Ø50.8 (no contact) | designed | all |
| foot holes | 3 × Ø4.5 | M4 clearance (ISO 273 medium) | designed | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| ISO | ISO 273 clearance holes for bolts and screws (fine / medium / coarse) | standard | dimensions are facts verify |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| burner-shroud-2in | burner shroud: shell Ø92 / Ø88 from 70 to 138.5 above its feet, lid to Ø54.8, 6 windows 14 × 10 under the lid, 3 legs 8 × 8 on r 49 with 20 × 12 × 4 feet out to r 65, Ø4.5 holes at r 59 | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-burner-shroud
How it fits
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Questions
Does the shroud touch the hot head?
No: 6 mm clear of the fins radially and 2 mm clear of the tube at the lid. It stands on its own feet.
Which heat sources fit?
Anything that fires up into the Ø88 open bottom: a torch head held in the torch stand, or a small gas burner.