I can see how upsetting this would be to continually have the dryer blow fuses. It can be difficult to diagnose the cause sometimes. A suggestion I have to help the expert provide a better answer is to add the model number to this thread. In the meantime I found a previous expert post that has some checks you may be able to use. Hope you find the cause soon.
Thank you for your question. Without having the model number of our dryer I will only be able to provide general information. Generally speaking, the thermal fuse will fail when there is a venting restriction/blockage or if the dryer is getting to hot. If it's an electric dryer then it could have a shorted heating element causing the heater to stay on or it could have a faulty operating thermostat if it's gas or electric.
Reply with the model number for model specific information.