Fluid transfer apparatus

A fluid transfer apparatus comprising:

• a rotating shaft having a rotation unit extending in an axial direction, and a first eccentric unit and a second eccentric unit disposed to be spaced apart from each other along the axial direction;
• a first rotor housing defining a first fluid compression space having an epitrochoid shape;
• a second rotor housing defining a second fluid compression space having an epitrochoid shape, 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 unit while surrounding the first eccentric unit in a radial direction of the first eccentric unit;
• 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 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 unit while surrounding the second eccentric unit in a radial direction of the second eccentric unit;
• a second rotor housing cover configured to cover the first fluid compression space and fluid communication space and disposed between the first rotor housing and the second rotor housing;
• and
• a third rotor housing cover configured to cover the second fluid compression space, and disposed at an opposite side of the second rotor housing cover with respect to the second rotor housing,
• wherein fluid accommodated in the first fluid compression space is transferred to the second fluid compression space or vice versa according to a rotating direction of the rotating shaft,
• wherein the first eccentric unit and the second eccentric unit are disposed to have an angle of 90° with respect to the rotation unit,
• wherein the first rotor housing and the second rotor housing are disposed to have an angle of 90° with respect to the rotation unit,
• wherein the first rotor firstly compresses fluid flowing into the first fluid compression space and the second rotor secondarily compresses the fluid flowing into the second fluid compression space from the first fluid compression space, while the rotating shaft rotates in a first direction,
• wherein the second rotor firstly compresses fluid flowing into the second fluid compression space and the first rotor secondarily compresses the fluid flowing into the first fluid compression space from the second fluid compression space, while the rotating shaft rotates in a second direction opposite to the first direction,
• wherein the first eccentric unit rotates eccentrically ahead of the second eccentric unit by 90° while the rotating shaft rotates in the first direction, and wherein the second eccentric unit rotates eccentrically ahead of the first eccentric unit by 90° while the rotating shaft rotates in the second direction.

A fluid transfer apparatus comprising:

• a rotating shaft having a rotation unit extending in an axial direction, and a first eccentric unit and a second eccentric unit disposed to be spaced apart from each other along the axial direction;
• a first rotor housing defining a first fluid compression space having an epitrochoid shape;
• a second rotor housing defining a second fluid compression space having an epitrochoid shape, 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 unit while surrounding the first eccentric unit in a radial direction of the first eccentric unit;
• 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 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 unit while surrounding the second eccentric unit in a radial direction of the second eccentric unit;
• a second rotor housing cover configured to cover the first fluid compression space and fluid communication space and disposed between the first rotor housing and the second rotor housing;
• and
• a third rotor housing cover configured to cover the second fluid compression space, and disposed at an opposite side of the second rotor housing cover with respect to the second rotor housing,
• wherein fluid accommodated in the first fluid compression space is transferred to the second fluid compression space or vice versa according to a rotating direction of the rotating shaft,
• wherein the first eccentric unit and the second eccentric unit are disposed to have an angle of 90° with respect to the rotation unit,
• wherein the first rotor housing and the second rotor housing are disposed to have an angle of 90° with respect to the rotation unit, and
• wherein the rotating shaft comprises:
• an axial hole formed through at least one of the first eccentric unit and the second eccentric unit in the axial direction;
• a radial hole formed through at least one of the first eccentric unit and the second eccentric unit so that an outer circumferential surface of the first eccentric unit and an inner circumferential surface of the axial hole communicate with each other or an outer circumferential surface of the second eccentric unit and an inner circumferential surface of the axial hole communicate with each other;
• and
• a circumferential groove formed in at least one of the first eccentric unit and the second eccentric unit to correspond to the radial hole.

A fluid transfer apparatus comprising:

• a rotating shaft having a rotation unit extending in an axial direction, and a first eccentric unit and a second eccentric unit disposed to be spaced apart from each other along the axial direction;
• a first rotor housing defining a first fluid compression space having an epitrochoid shape;
• a second rotor housing defining a second fluid compression space having an epitrochoid shape, 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 unit while surrounding the first eccentric unit in a radial direction of the first eccentric unit;
• 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 unit while surrounding the second eccentric unit in a radial direction of the second eccentric unit;
• a first fluid entrance housing and a second fluid entrance housing defining fluid entrance spaces and disposed at positions spaced apart from the first rotor housing and the second rotor housing in the axial direction, respectively;
• and
• a pulsation reducing unit configured to reduce a pulsation caused by variations of an inflow amount and an outflow amount of fluid due to a volume variation in the first and second rotor housings,
• wherein fluid accommodated in the first fluid compression space is transferred to the second fluid compression space or vice versa according to a rotating direction of the rotating shaft, and
• wherein the pulsation reducing unit comprises:
• a connection channel connecting the fluid entrance spaces of the first and second fluid entrance housings to each other so as to provide a movement path of the fluid;
• and
• a response portion disposed at one point on the connection channel to divide the connection channel into two regions, and configured to move on the connection channel according to the variations of the inflow amount and the outflow amount of the fluid in the fluid entrance spaces so as to change volumes of the fluid entrance spaces.

A fluid transfer apparatus comprising:

• a rotating shaft having a rotation unit extending in an axial direction, and a first eccentric unit and a second eccentric unit disposed to be spaced apart from each other along the axial direction;
• a first rotor housing defining a first fluid compression space having an epitrochoid shape;
• a second rotor housing defining a second fluid compression space having an epitrochoid shape, 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 unit while surrounding the first eccentric unit in a radial direction of the first eccentric unit;
• 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 unit while surrounding the second eccentric unit in a radial direction of the second eccentric unit;
• a channel housing defining fluid communication spaces and disposed between the first rotor housing and the second rotor housing;
• 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 configured to cover the first fluid compression space and the fluid communication spaces and disposed between the first rotor housing and the channel housing;
• a third rotor housing cover configured to cover the fluid communication spaces and disposed between the channel housing and the second rotor housing;
• and
• a fourth rotor housing cover configured to cover the second fluid compression space, and disposed at an opposite side of the third rotor housing cover with respect to the second rotor housing,
• wherein fluid accommodated in the first fluid compression space is transferred to the second fluid compression space or vice versa according to a rotating direction of the rotating shaft, and
• wherein the channel housing provides a channel so that fluid in the first and second fluid compression spaces moves to the first rotor housing or the second rotor housing through the fluid communication spaces.