High-temperature and high-pressure leakage-free internal self-circulation mechanical seal cooling system

The invention relates to a high-temperature and high-pressure leakage-free internal self-circulation mechanical seal cooling system which is installed on a pump cover of a pump and comprises a mechanical seal, a pump shaft, the pump cover, a throttling sleeve, a self-circulation pipeline and a sealing cooler, and a sealing cooling cavity is formed between the mechanical seal and the throttling sleeve. The cooling medium is arranged in the sealed cooling cavity; the self-circulation pipeline is communicated with the sealed cooling cavity, and meanwhile, the self-circulation pipeline is connected with a sealed cooler; through the operation of the pump shaft, a medium in the mechanical sealing cavity is driven to form self-circulation. According to the high-temperature and high-pressure leakage-free internal self-circulation mechanical seal cooling system, the use of a pump shaft seal under the severe working condition (high-temperature and high-pressure harmful media) can be effectively achieved, the service li