If you are using the Blubrry Powerpress plugin in Wordpress, you have a podcast only feed available to you already. Simply change your feed to this new URL and we will only import your episodes.
If you are using some other plugin or entering the episodes manually into Wordpress, you can create a podcast only category and use the category only feed on Blubrry.com.
You are more than welcome to continue to include your blog posts on blubrry.com, so do not feel pressured to have to change your feed.