v1 and v2 ect. that is to show the different rails, each 12V rail is capable of delivering 22A, unfortunately they do not "stack", meaning the maximum Amps that you will be able to sustain is 22A.
Now each rail has a common input, but are basicly the same circuit made in parallel, so that means that you effectively increase lifetime by reducing load on one circuit by spreading it over 2 or more, it is also more cost affective to create 2 or more Lower Amp rails opposed to one Hi Amp rail.
22A is actualy not bad at all.
just a basic example
___v1--12V convertion circuit---12V output
220/110V-input-------v2--12V convertion circuit----12V output
\___v3--12V convertion circuit----12V output