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Tri-clamp sealed diaphragm generator, 2 in

A sealed, pressurised gamma Stirling generator in 2 in tri-clamp: a finned one-piece hot head over a torch, a power membrane between the working space and a sealed cross, and a 2208 gimbal motor geared to the crank inside the cross, its leads out through a sealed pass-through.

Membrane 2 in at 12 mm: 11.33 mL swept · displacer Ø46 × 120 at 12 mm: 21.3 mL · dead volume 51.5 mL · swept / dead 0.220 · charge 2 bar gauge · Schmidt (600–700 K / 320 K): ±0.50–0.56 bar, 0.57–0.70 J per cycle · at 900 rpm about 4–8 W at the crank (West / Beale); 2208 gimbal generator at 2520 rpm, 19.7 V open circuit, about 2.1–5.5 W at 14–18 V out of 4–8 W at the crank

Exact dimensions. Every part is drawn at true size with no printing tolerance; each part's page lists its mating features and the fit each joint needs, so open those by your process's clearance before making the parts.

54 parts, every one a file here · all STL URLs · Markdown · tick lines as you go (saved in this browser)

Assembled engine

Sealed, pressurised gamma Stirling generator in 2 in tri-clamp fittings: a finned one-piece hot head in a burner shroud over a torch, a clamped power membrane under a sealed 2 in cross that holds the crank, and a 2208 gimbal motor geared 2.8 : 1 from the crankshaft inside the cross as the generator, 231 × 170 × 460 mm.

Assembly STEP (9.0 MB) · STL (10.6 MB) · 154 parts

Build order

1. Frame on the bench; torch stand (post toward +Y) with two M4 × 10, torch head in the ring with three M4 set screws; shroud on its three feet with M4 × 10.
2. Displacer: shell and cap, the Ø3 × 60 rod right through the cap (flush with its spigot face) on the cap's grub.
3. Membrane stack: backing disc under the membrane, crosshead hub on top, three M2 × 6 from the hub into the backing disc; Ø3 × 10 pin pressed in the hub's arm.
4. Hot head face up; displacer in; the rod up through the membrane stack; membrane on the head's face; cross (branches along the shaft line) on top; clamp. Jacket halves round the head with four M4 × 30, port caps in; spool hanger on the cross's lower run, bar to the wall with two M5 × 25.
5. Crank: con-rods with their 623s; displacer con-rod (40) in the rod clevis on a Ø3 × 12; clevis onto the rod; diaphragm con-rod (60) on the crosshead pin. Hub web on the −X shaft with its grub, displacer pin through it and the displacer con-rod, link web, diaphragm pin through the link web and the diaphragm con-rod, hub web on the +X shaft over the pin.
6. Spacers, the crank gear and flywheel discs on the shafts; each bearing plate with its two 623s over its shaft and into its branch with a Type B gasket and clamp; pocket flywheel on each shaft end; Type B gasket and flat end cap on each plate, clamp.
7. Motor: adaptor on the rotor top with four M2 × 4, pinion on its stub with the grub; base to the mount face with four M3 × 6 countersunk; leads up through the plate's bore. Type B gasket, motor-mount plate onto the top of the cross with the pinion in mesh, clamp.
8. Leads through the sealed pass-through in the port cap; Type B gasket and port cap on the mount plate, clamp; fill valve, gauge and relief valve in the other ports. Charge slowly (see the questions below).

Agents: each row's object has /api/geometry?object=slug and the MCP tool get_free_files; the STL list above is every part.

JSON: /api/geometry?object=list-tri-clamp-sealed-diaphragm-generator