My cheap little compressor has stopped switching itself off and on when it reaches the set pressure.
The on/off switch mechanism seems very simple. The contacts are closed and the machine operates when one pulls the red knob up. When you push it down the contacts open and the machine switches off.
That's fair enough.
But how does the pressure sensing/switching mechanism work? I can't figure it out.
There are two pipes going up to the switch mech from the tank. A small one and a big one.
The small one leads to a little plastic rod that can be pushed UP towards a brass hinged plate at the bottom of the switch mechanism. UP. Not down. When the machine is operating that plate is in the UP position.
Pushing it UP wouldn't seem to do anything.
And the large pipe leads to a large brass spring and it's equally hard to see what it might do.
For the life of me I can't figure out how it works.
GMC, a chinese company, 'Global Machinery Company', went bust in the financial meltdown. They're finished now. But they sold many thousands of these low cost machines and I'm hoping someone has run across them and knows something about how they work.
Perhaps the same mechanism is currently in use is some other Chinese made machines on the market today.
I have attached a couple of pics to this post and I have some more pics of the mechanism up on Picasa at:
https://picasaweb.google.com/abrogard/Compressor?authuser=0&authkey=Gv1sRgCJW_-aDo_7zj9gE&feat=directlink
ab
The on/off switch mechanism seems very simple. The contacts are closed and the machine operates when one pulls the red knob up. When you push it down the contacts open and the machine switches off.
That's fair enough.
But how does the pressure sensing/switching mechanism work? I can't figure it out.
There are two pipes going up to the switch mech from the tank. A small one and a big one.
The small one leads to a little plastic rod that can be pushed UP towards a brass hinged plate at the bottom of the switch mechanism. UP. Not down. When the machine is operating that plate is in the UP position.
Pushing it UP wouldn't seem to do anything.
And the large pipe leads to a large brass spring and it's equally hard to see what it might do.
For the life of me I can't figure out how it works.
GMC, a chinese company, 'Global Machinery Company', went bust in the financial meltdown. They're finished now. But they sold many thousands of these low cost machines and I'm hoping someone has run across them and knows something about how they work.
Perhaps the same mechanism is currently in use is some other Chinese made machines on the market today.
I have attached a couple of pics to this post and I have some more pics of the mechanism up on Picasa at:
https://picasaweb.google.com/abrogard/Compressor?authuser=0&authkey=Gv1sRgCJW_-aDo_7zj9gE&feat=directlink
ab
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