Sealing device and integrated pump

An integrated pump, comprising:

• a rotary shaft;
• an oxidizer impeller, a fuel impeller and a turbine attached to the rotary shaft in this order in an axial direction of the rotary shaft;
• a first bearing rotatably supporting the rotary shaft between the oxidizer impeller and the fuel impeller;
• a second bearing rotatably supporting the rotary shaft between the fuel impeller and the turbine;
• and
• a first seal device disposed between the first bearing and the fuel impeller;
• and
• a second seal device disposed between the second bearing and the turbine, wherein
• each of the first and second seal devices includes:
• a plurality of non-contact seals provided along the rotary shaft;
• a contact seal provided on at least one of two sides of the plurality of non-contact seals;
• an injection part that supplies purge gas into a first space of spaces arranged in the axial direction, the spaces being between the plurality of non-contact seals and the contact seal;
• and
• a collector that collects the purge gas from a second space of the spaces between the plurality of non-contact seals and the contact seal, the second space being positioned next to the first space in the axial direction,
• the first bearing, the plurality of non-contact seals of the first seal device, and the contact seal of the first seal device are disposed in this order, and
• the second bearing, the plurality of non-contact seals of the second seal device, and the contact seal of the second seal device are disposed in this order.