Inflatable expansion seals are a new type of seal made of silicone rubber with a hollow structure inside. These seals are designed to be used with compressed air sources, utilizing inflation and deflation to alter the structure of the silicone rubber seal. Due to the flexibility of silicone rubber, the inflated seal is malleable. After contact with the sealing surface, it undergoes flexible curve deformation, allowing it to seal gaps that are linear or curved in shape. Upon deflation, the seal automatically retracts to its original shape, restoring the equipment gap. They can quickly achieve sealing and unsealing, with repeated inflation and deflation capable of up to one million cycles. In operation, the internal gas pressure of the seal body provides high sealing strength, resulting in excellent sealing performance and high airtightness. The shape of the hollow structure of the seal body is designed according to the seal gap size, fluid pressure, and frequency of expansion and contraction. Like solid-core seals, inflatable seals can achieve radial and axial sealing for equipment.