There are many factors that could be preventing it from reblooming.
One is simply light level. Phalaenopsis are not particularly demanding of light, but if it was being grown brighter before you got it, it may have not had time to fully acclimate itself yet. You can either wait, or supplement the light a bit, as Roberta did, but don't overdo it.
If, on the other hand, it has adjusted but still won't bloom, you might simply be keeping it at too steady of a temperature. Phals grow best when warm, but they may be hesitant to bloom (depending upon the species in the background) unless they are exposed to a reduction in the average growing temperature of about 6°-10°C for a couple of weeks.
Another possibility, but not so typical, would be overfeeding the plant - i.e., giving it too much nitrogen.
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