How to use Adobe Bridge's internal photo viewer when I double click on images?

When you double-click an image thumbnail in Bridge, it will open in ACR if it's a raw image (or a JPG or TIF that has already been adjusted in ACR), or will open in Photoshop if it's a bitmapped image or Illustrator if it's a vector image. Etc.

If you want to just see the image, just click once on it, and it will display in the Preview Panel.

I hope this answers your question as I'm not fully sure what your question is.