Frequency of appointments with Ph.D. supervisor I am a recent PhD student. My adviser is really a very nice, kind, and open-minded person. They are always open to discuss about subjects of my interest. 
As I am almost at the half of my first year, my rhythm of working has evolved from making lectures to doing something concrete. So, I have started to contact my adviser more often in the last month. 

How often a PhD student can see his supervisor? Is it really disturbing to send them some results to take their opinion every week? For the moment, my adviser does not seem to be disturbed but are there some "implicit" norms that have escaped me?
The frequency that students and advisors meet depends a lot on the particular student and advisor, and also varies highly by time.  In my experience, once a month is quite a bit on the low side, but not unusually so.  A more typical pacing is once a week or once every two weeks.  

The reason for this frequency is not for the sake of "norms", but rather is a good spacing for giving enough time for the student to accomplish something but not so much so that the student is likely to end up wasting a lot of time or becoming very frustrated going down a bad path that the advisor might have been able to detect and help remedy.

If your advisor is meeting with you once a month and happy with your progress, then perhaps you are simply doing very well at self-direction.  It is quite reasonable, however, to ask for more frequent supervision if you think that you will benefit, and as a new Ph.D. student, I think that you likely should do so.