even thou each application is judged on its own merits, applying just after a refusal for a settlement visa could have a negative impact on a visit visa, as the embassy could say your desperate to come to the UK and don't believe your a genuine visitor.

but then again you've been on a visit visa once so that's in your favor, i would leave it a few months and make sure your application is strong as possible before you apply for a visit visa again, getting a visit visa can be hit and miss most of the time anyway