Library › Hardware › Stirling & thermoacoustic ·

Tri-clamp volume fillers: 2 in tee-run plugs and annular sleeves

Name: Tri-clamp volume fillers: 2 in tee-run plugs and annular sleeves dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How do I reduce dead volume in a tri-clamp Stirling engine? · Hardware · basis: ASME BPE 2 in bore (Ø47.5); ISO 2852 Type B lip reach (2.8 from the joint plane, 1.95 past the face); passage and gap sizes are design values

Long Earth Society build part. The plugs I use to take the dead volume out of my 2 in diaphragm engines. 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: 4 in table

Notes

Every cubic centimetre of gas that is not swept and not in a heat exchanger lowers the pressure swing. These plugs fill the parts of the fittings where the gas does no work and leave a defined path through them.
Tee-run plugs fill the 177.8 mm run of a 2 in tee between the two gasket lips. The blind plug (173.9 long) has a Ø16 passage from one end to the centre and out to the branch; the half beyond the branch is solid, so a capped run end holds no gas. The rod plug has a Ø12 passage end to end so a Ø3 displacer rod passes through it.
Annular sleeves fill a spool with a 1.0 mm gas gap along the tube wall: the core is Ø45.5, three 3 mm ribs touch the bore. On the hot leg the gap is the heater; on the cold leg the cooler.
All outer diameters are the bore, Ø47.5: a slide fit (Mating features). The gaps and passages are designed.

Sizes

file	od_mm	length_mm	passage
plug-tee-2in-blind	47.5	173.9	Ø16 axial to centre + Ø16 radial
plug-tee-2in-rod-106.55	47.5	106.55	Ø12 axial through + Ø16 radial
sleeve-2in-76.2	47.5	76.2	1.0 annular gap
sleeve-2in-32	47.5	32.0	1.0 annular gap

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
plug OD	Ø47.5	2 in tube bore	slide	plug-*
sleeve rib tips	Ø47.5	2 in tube bore	slide	sleeve-*
rod passage	Ø12	Ø3 displacer rod (no contact)	designed	plug-tee-2in-rod-*
flow passages	Ø16	gas path to the branch	designed	plug-*
annular gap	1.0	gas gap along the tube wall	designed	sleeve-*

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

ISO (via iTeh sample)	ISO 2852 clamp liners: face profile and flange / groove diameters	PDF	standard excerpt; dimensions are facts
ASME	BPE Bioprocessing Equipment (clamp fitting dimensions, tube OD and wall)	standard	ASME; dimensions are facts verify
Long Earth Society	Engine builds	web, video	LES site

Free files

★ Free files 4 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

plug-tee-2in-blind	2 in tee-run plug Ø47.5 × 173.9: Ø16 passage from one end to the centre, then Ø16 out to the branch; the other half solid	STEP · STL
plug-tee-2in-rod-106.55	2 in tee-run plug Ø47.5 × 106.55: Ø12 passage end to end for the displacer rod and the gas, Ø16 out to the branch at 19.60 from the bottom	STEP · STL
sleeve-2in-76.2	2 in annular sleeve Ø45.5 × 76.2 with three 3 mm ribs to Ø47.5: 1.0 mm gas gap along the tube wall (hot spool)	STEP · STL
sleeve-2in-32	2 in annular sleeve Ø45.5 × 32 with three ribs to Ø47.5: 1.0 mm gas gap (cold spool, above the regenerator)	STEP · STL