Blower
A blower includes a centrifugal fan and a partition wall disposed in a suction space in the centrifugal fan. The partition wall has a base portion extending along a fan central axis to partition the suction space into a first space for a first fluid and a second space for a second fluid. The partition wall has an enlarged portion connected to an end of the base portion on another side of the fan central axis. The enlarged portion covers a part of a fan boss. A clearance passage is defined between the enlarged portion and the fan boss and has a first space side opening and a second space side opening. The enlarged portion is biased in the suction space to the second space such that a pressure at the second space side opening is less than a pressure at the first space side opening.
1. A blower configured to blow a first fluid and a second fluid, the blower comprising:
a centrifugal fan configured to rotate about a fan central axis so as to draw the first fluid and the second fluid from one side of the fan central axis and blow the first fluid and the second fluid outward in a direction away from the fan central axis; and
a partition wall that is disposed in a suction space defined on an air suction side of the centrifugal fan, the partition wall being spaced from the centrifugal fan, wherein
the centrifugal fan includes
a plurality of blades arranged around the suction space and spaced from each other, the plurality of blades being configured to draw an air from the one side of the fan central axis by rotating about the fan central axis, and
a fan boss that connects an end of each blade of the plurality of blades on another side of the fan central axis with each other,
the partition wall has
a base portion that extends along the fan central axis in the suction space so as to partition the suction space at least into a first space through which the first fluid flows and a second space through which the second fluid flows, and
an enlarged portion connected to an end of the base portion on the other side of the fan central axis, the enlarged portion extending in a direction from the fan central axis toward the plurality of blades so as to cover a part of the fan boss,
the base portion extends in the direction away from the fan central axis such that both ends farthest from the fan central axis in the base portion face the plurality of blades with a gap,
a clearance passage is defined between the enlarged portion and the fan boss,
the clearance passage has a first space side opening that opens in the first space and a second space side opening that opens in the second space,
the first space side opening and the second space side opening communicate with each other through the clearance passage,
the enlarged portion is biased in the suction space to the second space such that a pressure at the second space side opening is less than a pressure at the first space side-opening, and
an area of a part of the enlarged portion covering the fan boss in the second space is larger than an area of a part of the enlarged portion covering the fan boss in the first space.
2. A blower configured to blow a first fluid and a second fluid, the blower comprising:
a centrifugal tan configured to rotate about a fan central axis so as to draw the first fluid and the second fluid from one side of the fan central axis and blow the first fluid and the second fluid outward in a direction away from the fan central axis; and
a partition wall that is disposed in a suction space defined on an air suction side of the centrifugal fan, the partition wall being spaced from the centrifugal fan, wherein
the centrifugal fan includes
a plurality of blades arranged around the suction space and spaced from each other, the plurality of blades being configured to draw an air from the one side of the fan central axis by rotating about the fan central axis, and
a fan boss that connects an end of each blade of the plurality of blades on another side of the fan central axis with each other,
the partition wall has
a base portion that extends along the fan central axis in the suction space so as to partition the suction space at least into a first space through which the first fluid flows and a second space through which the second fluid flows, and
an enlarged portion connected to an end of the base portion on the other side of the fan central axis, the enlarged portion extending in a direction from the fan central axis toward the plurality of blades so as to cover a part of the fan boss,
the base portion extends in the direction away from the tan central axis such that both ends farthest from the fan central axis in the base portion face the plurality of blades with a gap,
a clearance passage is defined between the enlarged portion and the fan boss,
the clearance passage has a first space side opening that opens in the first space and a second space side opening that opens in the second space,
the first space side opening and the second space side opening communicate with each other through the clearance passage,
the enlarged portion is biased in the suction space to the second space such that a pressure at the second space side opening is less than a pressure at the first space side opening,
a part of the fan boss located in the first space is a first fan boss portion,
a part of the fan boss located in the second space is a second fan boss portion,
the enlarged portion covers the first fan boss portion and the second fan boss portion, and
an area of the enlarged portion covering the second fan boss portion is larger than an area of the enlarged portion covering the first fan boss portion.
3. The blower according to claim 2 , wherein
a part of the enlarged portion covering the second fan boss portion has a length from the fan central axis to an outer edge portion facing leading edges of the plurality of blades, the length being longer than that of a part of the enlarged portion covering the first fan boss portion.
4. A blower configured to blow a first fluid and a second fluid, the blower comprising:
a centrifugal fan configured to rotate about a fan central axis so as to draw the first fluid and the second fluid from one side of the fan central axis and blow the first fluid and the second fluid outward in a direction away from the fan central axis; and
a partition wall that is disposed in a suction space defined on an air suction side of the centrifugal fan, the partition wall being spaced from the centrifugal fan, wherein
the centrifugal fan includes
a plurality of blades arranged around the suction space and spaced from each other, the plurality of blades being configured to draw an air from the one side of the fan central axis by rotating about the fan central axis, and
a fan boss that connects an end of each blade of the plurality of blades on another side of the fan central axis with each other,
the partition wall has
a base portion that extends along the fan central axis in the suction space so as to partition the suction space at least into a first space through which the first fluid flows and a second space through which the second fluid flows, and
an enlarged portion connected to an end of the base portion on the other side of the fan central axis, the enlarged portion extending in a direction from the fan central axis toward the plurality of blades so as to cover a part of the fan boss,
the base portion extends in the direction away from the tan central axis such that both ends farthest from the fan central axis in the base portion face the plurality of blades with a gap,
a clearance passage is defined between the enlarged portion and the fan boss,
the clearance passage has a first space side opening that opens in the first space and a second space side opening that opens in the second space,
the first space side opening and the second space side opening communicate with each other through the clearance passage,
the enlarged portion is biased in the suction space to the second space such that a pressure at the second space side opening is less than a pressure at the first space side opening,
a part of the fan boss located in the first space is a first fan boss portion,
a part of the fan boss located in the second space is a second fan boss portion, and
the enlarged portion covers only the second fan boss portion in the first fan boss portion and the second fan boss portion.
5. A vehicular air-conditioning device configured to perform an inside-outside air mode in which an outside air is introduced from an outside of a passenger compartment and an inside air introduced from the passenger compartment circulates in the passenger compartment, the vehicular air-conditioning device comprising:
the blower according to claim 1 , wherein
the first fluid is the outside air, and
the second fluid is the inside air.