Pressure protection device and immersion cooling device

An immersion cooling device comprising:

• a seal chamber;
• and
• a pressure protection device comprising:
• a housing mounted on the seal chamber and communicating with the seal chamber, the housing comprising a receiving chamber communicating with the seal chamber and the housing defining at least one first gas hole and at least one second gas hole each communicating the receiving chamber to an ambient environment, the at least one first gas hole being closer to the seal chamber than to the at least one second gas hole;
• a sliding block slidably disposed in the receiving chamber and dividing the receiving chamber into a first space and a second space, the first space communicating with the seal chamber, the sliding block defining a through hole communicating the first space with the second space;
• and
• an adjusting block received in the first space, the adjusting block being configured to be attracted to the sliding block so that the through hole is selectively blocked by the adjusting block,
• wherein the pressure protection device is switchable among a first state, a second state, and a third state,
• in the first state, the at least one first gas hole is blocked by the sliding block, and the through hole is blocked by the adjusting block,
• in the second state, the sliding block and the at least one first gas hole are staggered from each other, the at least one first gas hole communicates with the first space, and the through hole is blocked by the adjusting block, and
• in the third state, the at least one first gas hole is blocked by the sliding block, the adjusting block is separated from the sliding block, and the first space communicates with the ambient environment through the through hole and the at least one second gas hole.