Fluid transfer device

A fluid transfer device, comprising:

• a first fluid entrance housing into which fluid is introduced through an inlet formed at one side of the first fluid entrance housing, and a second fluid entrance housing disposed to be spaced apart from the first fluid entrance housing and configured to compress and discharge the introduced fluid;
• a rotating shaft comprising a rotating portion extending in an axial direction, and a first eccentric portion and a second eccentric portion disposed to be spaced apart from each other along the rotating portion;
• a first rotor housing defining a first fluid compression space having an epitrochoid surface;
• a second rotor housing defining a second fluid compression space having an epitrochoid surface, and disposed to be spaced apart from the first rotor housing in the axial direction;
• a first rotor disposed in the first fluid compression space so as to divide the first fluid compression space into a plurality of variable-volume spaces, and coupled to the first eccentric portion while surrounding the first eccentric portion in a radial direction of the first eccentric portion;
• a second rotor disposed in the second fluid compression space so as to divide the second fluid compression space into a plurality of variable-volume spaces, and coupled to the second eccentric portion while surrounding the second eccentric portion in a radial direction of the second eccentric portion;
• rotor housing covers disposed to cover opposite surfaces of the first rotor housing and opposite surfaces of the second rotor housing, respectively;
• and
• a channel housing disposed between the first rotor housing and the second rotor housing to define a fluid communication space,
• wherein an inner side surface of the first rotor housing and an inner side surface of the second rotor housing are each provided with a pothole,
• wherein the channel housing provides a channel so that fluid in the first fluid compression space and fluid in the second fluid compression space move between the first rotor housing and the second rotor housing through the fluid communication space, and
• wherein the rotor housing covers comprises:
• a first rotor housing cover configured to cover the first fluid compression space and disposed at one side of the first rotor housing;
• a second rotor housing cover disposed between the first rotor housing and the channel housing so as to cover the first fluid compression space and the fluid communication space;
• a third rotor housing cover configured to cover the fluid communication space and disposed between the channel housing and the second rotor housing;
• and
• a fourth rotor housing cover disposed on an opposite side of the third rotor housing cover with respect to the second rotor housing so as to cover the second fluid compression space.