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Thermoacoustic driver cap: ISO 2852 cap with a Ø40 speaker socket, 1.5, 2 and 3 in
How do I mount a speaker on a tri-clamp thermoacoustic tube? · Hardware · basis: ISO 2852 cap face; Ø40 × 6 socket for a 40 mm speaker frame; Ø28 opening to the tube
Long Earth Society build part. The stacks, driver cap and tube-length table from the LES thermoacoustic builds; the infill trick is LES's. 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 that holds a 40 mm speaker on the resonator: as a driver it makes a thermoacoustic refrigerator, as a load it turns the engine's sound into a few milliwatts.
- On the back of the 6 mm cap: a Ø48 × 8 boss with a Ø40 socket 6 mm deep (floor 8 mm above the face) and a Ø28 opening through to the tube. Overall 14 mm.
- Flange Ø50.5 / 64.0 / 91.0 for 1.5 / 2 / 3 in.
Sizes
| size_in | flange_od_mm | speaker_socket_mm | opening_mm | height_mm |
|---|---|---|---|---|
| 1.5 | 50.5 | Ø40 × 6 | 28 | 14 |
| 2 | 64.0 | Ø40 × 6 | 28 | 14 |
| 3 | 91.0 | Ø40 × 6 | 28 | 14 |
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 |
|---|---|---|---|---|
| speaker socket | Ø40 | 40 mm speaker frame | socket | driver-cap-* |
| driver-cap face | ISO 2852 | ferrule face + Type B gasket | clamp | driver-cap-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Thermoacoustic heat engine | web | CC BY-SA 4.0 (text) |
| G. W. Swift (LANL) | Thermoacoustics: A Unifying Perspective for Some Engines and Refrigerators (textbook; DeltaEC software free) | web, software | LANL verify |
| NASA (NTRS, public domain) | Thermoacoustic Stirling heat engine for space power | US Government work, public domain | |
| Long Earth Society | Engine builds | web, video | LES site |
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
| driver-cap-1.5in-40mm-speaker | 1.5 in ISO 2852 cap with a Ø40 × 6 socket (floor 10.5 above the face) for a 40 mm speaker, Ø28 port through to the bore (thermoacoustic refrigerator driver / engine load) | STEP · STL |
| driver-cap-2in-40mm-speaker | 2 in ISO 2852 cap with a Ø40 × 6 socket (floor 8 above the face) for a 40 mm speaker, Ø28 port through to the bore (thermoacoustic refrigerator driver / engine load) | STEP · STL |
| driver-cap-3in-40mm-speaker | 3 in ISO 2852 cap with a Ø40 × 6 socket (floor 8 above the face) for a 40 mm speaker, Ø28 port through to the bore (thermoacoustic refrigerator driver / engine load) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=thermoacoustic-driver-cap
How it fits
Goes in or on
Tri-clamp spool, 1.5 and 2 inchISO 2852 face on the resonator's open ferruleConnects to
Speakers, amplifiers and microphones40 mm speaker in the Ø40 socket
Thermoacoustic stack for tri-clamp spoolsdrives or loads the resonator the stack sits inAlternatives
Linear alternator moverpiston load for more powerAlso needed
Tri-clamp clamp, two-boltclamp and gasket on the faceQuestions
What speaker fits the driver cap?
A 40 mm frame in the Ø40 × 6 socket; the cone faces the tube through a Ø28 opening.
Can a thermoacoustic engine make electricity?
A speaker in this cap works as a generator at milliwatt level; for more, a piston on the linear alternator.