Generally, nothing prevents you from re-applying for a visitor visa shortly after a 214(b) refusal. However, you should be aware that consular officers are able to access detailed records of previous interviews, including the reasons for a denial, and may not look favorably upon re-applications within a short period of time. Therefore, unless you are able to show that your situation has changed since your last visit, or provide new and material evidence that was not previously considered, it is probably better for you to allow more time to pass before re-applying.