http://www.SunriseEnergy.org/images/drum_valve_17.pdf
Driven by a 3/8" I.D. steam line.
Spin the drum shaft with a cordless drill for an initial test.
http://www.SunriseEnergy.org/images/drum_valve_18.pdf
Ken, How bout a quick description of throttle and cut-off and
importance.
Does the valve guide seal steam pressure?
Does the valve guide require lubrication?
How do standard components hold up with steam/corrosion?
(i've heard they last 'long enough')
(plus, replacements are simple enough)
(stainless is always a go to)
Mark, I found this link helpful:
http://en.wikipedia.org/wiki/Stephenson_valve_gear
We already have a complex 90* conversion device.
My focus went to this area.
We can simplify the eccentric strap to a simple eccentric rod (wobble
shaft).
Shifting complexity towards the 90* area.
I know this is ratio is adjustable. I have already thought of several
ways to make adjustments while it is still (which is good). However,
There are moving parts in constant motion. The trick is to make it
adjustable on the fly.
By changing the simple three point rocker plate to a more complex set
of arms, we can achieve adjustments over this ratio.
I believe one axis on an a threaded rod gives us the needed
articulation for dynamic ratio adjustment.
I'm still mulling this over- and need to draw it....
I thought of a 'latching' poppet valve in piston concept.
This gave way to an 'inertia' poppet valve in piston concept.
Which actually requires an 'inverted inertia' activated poppet
(cantilevered mass).
LATCHING VALVE
When the poppet is extended (open/exhaust position) a spring tensioned
latch engages and locks the poppet open. This occurs at/near BDC. The
piston travels upward venting most/all expanded vapor. At TDC a
'piston button' touches top of cylinder and the trips a manual
release, allowing the poppet to spring close. Steam poppet opens re-
pressurizing the cylinder for expansion stroke. The steam expands
against the now closed poppet in piston, until the piston reaches BDC,
where the poppet is manually opened - engaging the spring tensioned
latch.
The thought occurred that the spring may not offset the poppet
valve's inertia forces at higher/extreme rpm.
I thought of the mass-vector timings...
Could the poppet naturally (inertia) open and close at the right time?
Unfortunately it is opposite of what we need for sympathetic inertia
help.
This is how the inertia concept originated.
The piston can mount a mass greater than the poppet on a cantilever to
induce sympathetic inertia help.
Actually, the mass need only be strong enough to allow the valve
spring to close at our target maximum rpm.
(This assumes that the spring is not strong enough to close it in the
first place!)
Perhaps the cantilevered piston poppet valve would open and close
naturally without need of manual (activation, latching, release)?
Not sure? My head hurts...
A uniflow without re-compression issues (by venting expanded vapors
through a poppet that stays open throughout the entire return stroke)
is EPIC!
Immediate upcoming issue: steam vents to gear box.... i'm working on
it :)
What do you all think?
Has this been done before?