2. Patents can protect the production technology, processing and manufacturing methods, structure or structure of products; The purpose of patent application is to encourage invention and creation;
If others improve on your basis and make a generator with better performance, then you must agree to implement this patent.
If someone else makes a structure completely different from yours according to your principle, and its performance is similar to or better than yours, then the patent is not within your protection scope.
Like the example you gave, you can apply for a patent. Because it meets the three characteristics of patent: novelty, practicality and creativity.
4. Its protection scope is the whole structure of the hair dryer, and if the invention is applied, it can also protect the manufacturing method for manufacturing the hair dryer.