Rework Station Pump - Can They Be Repaired ?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Two more pics and a new theory.

The first pic is the unit right side up. One hose goes in the top into the main chamber while the other end is just left hanging inside the case. Maybe just to keep the main chamber itself from pressurizing. Each diaphragm goes into the rear chamber (purpose ??) and one hose leaves that chamber and goes to a plastic tank. The outlet of that tank feeds the hot air wand.

The second pic shows the valves on the inside of the diaphragm cover.

Do you think the piston should contain two permanent magnets or some non-magnetized steel ? If there was no attraction then the piston would sit properly until the coils were energized.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

The holes in the diaphragms are just positioning holes. They fit into the four prongs on either end of the piston maybe to keep the piston from torquing so it stays true between the electromagnets.

If it's ok to cover those holes then maybe you could add a rubber washer, to stiffen the diaphragm - maybe even 'super-goop' it to the top, being careful that it's concentric and
any glue layers are even, all depending on if there's room for the additional material in the manifolds - could just be a very tempoary repair, but might be worth the trouble, probably easier than finding new diaphragms.

Here's two pictures I pulled from the net of the same unit with it partially disassembled.

I bet there's a reed valve in those manifolds 8^)

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

The two lines from the diaphragm covers go into some sort of equalization chamber which has a single line out feeding the wand. So one line in, one line out.

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

sooo.... how many air couplings are on it?
i see one on each diaphram cover - is it one in and one out?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Here's two pictures I pulled from the net of the same unit with it partially disassembled.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

I will try to take some better pictures guys I know the ones I already posted are not the best.

The holes in the diaphragms are just positioning holes. They fit into the four prongs on either end of the piston maybe to keep the piston from torquing so it stays true between the electromagnets.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

good point - we need much closer foto's of the pole ends and diaphrams.

I concur - also would like to see where the heat-wand sources its air from (or plugs into or whatever) 8^)

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

good point - we need much closer foto's of the pole ends and diaphrams.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

if the diaphram is suposed to be on the polepiece, when it pushes it should cover the 4 outer holes, and when it pulls it should expose them.

Okay, that makes sense, kind of similar to reed valves in operation - but it seems like it would always be sucking then, unless it's ported something like a 2-cycle diesel engine.

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

if the diaphram is suposed to be on the polepiece, when it pushes it should cover the 4 outer holes, and when it pulls it should expose them.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

The diaphragms are mounted to the spindle by a small nut, and secured around the perimeter by the chambers that get screwed down over them to the main assembly.

Is it obvious how this thing built pressure, ie reed valves or some other separate mechanism, or did it depend on those holes in the diaphragm to somehow do the job?

Stab at theory of operation - the coils receive a pulsed voltage pulling one of the the piston magnets in line with the core providing a full stroke in one direction. When the pulse abates the piston returns to the center position where the next pulse pushes it further in that direction until the second piston magnet is in line with the core and the cycle continues. Is any of that correct ?

I was thinking it was just running mains frequency thru the coils, doing cycles of attraction/repulsion, but I could be wrong and you right. That motor is really cool, though, must be nearly zero friction when it's working...

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

i would say the diaphrams have somehow broken loose from the pole-piece.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Is it safe to hook a scope to the coil source ? Maybe this is missing half the wave...

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

The diaphragms are mounted to the spindle by a small nut, and secured around the perimeter by the chambers that get screwed down over them to the main assembly.

Stab at theory of operation - the coils receive a pulsed voltage pulling one of the the piston magnets in line with the core providing a full stroke in one direction. When the pulse abates the piston returns to the center position where the next pulse pushes it further in that direction until the second piston magnet is in line with the core and the cycle continues.

Is any of that correct ?

[stj]

Re: Rework Station Pump - Can They Be Repaired ?

the white is flux that got wet because they washed the pcb without removing it all first.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

Some pics... they've all been rotated, yay.

The first pic shows the core with dual coils wired in series. Both coils ohm out to about 146ohm so I think they're good ??

The second shows the "piston" with dual magnets.

The third shows the piston inserted between the coils.

The fourth is the housing that the assembly slides down into.

The fifth is the control board.

There is no "track" or discernible way for the piston to be kept in place. In pic 3 the magnets are easily drawn to the core so when the whole unit is assembled they remain bound to each other such that no movement is possible whether power is applied to the coils or not. This is what makes me think the diaphragms (damn, pic coming!) should be stiff enough that when assembled they keep the piston BETWEEN the coils.

I'm sure someone here knows the precise theory of operation here so help me out. Are the diaphragms to blame or something else ?

Strange looking motor, for sure, I've never seen one like that. How are/were the diaphragms attached to the spindle? Just a guess, maybe each diaphrapm was ultrasonically or chemically welded to the black piece on each end, which made them stiff enough to keep things in place.

Looks like some kind of deposit on the control board, what do you reckon that is?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Diaphragms. You can see in the third pic how easy it is to distort them with one hand.

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Some pics... they've all been rotated, yay.

The first pic shows the core with dual coils wired in series. Both coils ohm out to about 146ohm so I think they're good ??

The second shows the "piston" with dual magnets.

The third shows the piston inserted between the coils.

The fourth is the housing that the assembly slides down into.

The fifth is the control board.

There is no "track" or discernible way for the piston to be kept in place. In pic 3 the magnets are easily drawn to the core so when the whole unit is assembled they remain bound to each other such that no movement is possible whether power is applied to the coils or not. This is what makes me think the diaphragms (damn, pic coming!) should be stiff enough that when assembled they keep the piston BETWEEN the coils.

I'm sure someone here knows the precise theory of operation here so help me out. Are the diaphragms to blame or something else ?

[mmartell]

Re: Rework Station Pump - Can They Be Repaired ?

Yes good idea. Will put some up later today.

[xelectech]

Re: Rework Station Pump - Can They Be Repaired ?

Should the diaphragms be strong enough to keep the piston from being pulled sideways to one of the coils ?

How 'bout a picture or 2?