Abstract: A centrifugal fan includes: an impeller having a back plate; and a scroll casing including a peripheral wall a first side wall facing a virtual extension of the back plate and an inner end portion of the volute shape of the scroll casing, an expanded portion, and a first edge end portion being an end of a first edge defining the discharge port, of the first side wall, are arranged in a named order in the rotation direction, the first edge end portion being farther from the rotation shaft than an other end of the first edge and distance L1?distance LM?distance LS>is satisfied where LS is a distance between the first side wall at the inner end portion of the volute shape and the virtual extension of the back plate, LM is a distance between the first side wall at the expanded portion and the virtual extension of the back plate, the expanded portion being a portion at which the distance between the first side wall and the virtual extension of the back plate is larger than LS, and L1 is a distance between the f

Abstract: An impeller includes a backing plate, a rim disposed so as to face the backing plate, and a plurality of blades arranged in a circumferential direction around a virtual rotation axis of the backing plate. Each of the plurality of blades has an inner circumferential end, an outer circumferential end a sirocco blade portion being forward-swept and including the outer circumferential end and having a blade outlet angle of larger than 90 degrees, and a turbo blade portion being swept-back and including the inner circumferential end, a first region located closer to the backing plate than a middle point in an axial direction of the rotation axis, and a second region located closer to the rim than the first region. Each of the plurality of blades is formed such that a blade length in the first region is longer than a blade length in the second region.

Abstract: An air-conditioning apparatus includes a casing; a heat exchanger disposed in the casing; a sirocco fan disposed in the casing and located upstream of the heat exchanger along a flow passage such that an air outlet of the sirocco fan faces the heat exchanger; a drain pan disposed in the casing and located below the heat exchanger, the drain pan receiving drain water generated in the heat exchanger; and a dew-scattering-reducing part that reduces scattering of the drain water. The dew-scattering-reducing part is disposed outside a region enclosed by extension lines from the air outlet toward the heat exchanger and inside the drain pan.

Abstract: A centrifugal air blower comprises a fan (2); and a scroll casing (4). The scroll casing includes: a sidewall (4c) covering the fan (2) from an axial direction of a rotation axis on which the fan (2) rotates, the side wall having a suction opening for sucking air; a discharge opening (41) for discharging an airflow generated by the fan (2); a tongue portion (4b) for guiding the airflow to the discharge opening (41); a peripheral wall (4a) surrounding the fan (2) from a radial direction of the rotation axis; and a bell mouth (3) formed along the suction opening (5) of the sidewall (4c). The bell mouth (3) includes an upstream end (3a) and a downstream end (3b), the upstream end being an end portion on an upstream side in a direction of flow of the air passing through the suction opening (5), the downstream end being an end portion on a downstream side in the direction of flow of the air.

Abstract: A centrifugal blower includes a fan including a main plate having a disk-shape, and a plurality of blades, and a scroll casing configured to accommodate the fan. The scroll casing includes a discharge portion and a scroll portion including a side wall, a circumferential wall, and a tongue portion. The circumferential wall includes a curved circumferential wall and a flat circumferential wall. In comparison with a centrifugal blower including a standard circumferential wall having a logarithmic spiral shape in cross-section perpendicular to a rotational shaft of the fan, in the curved circumferential wall, at a first end being a boundary between the circumferential wall and the tongue portion and at a second end being a boundary between the circumferential wall and the discharge portion, a distance L1 between an axis of the rotational shaft and the circumferential wall is equal to a distance L2 between the axis of the rotational shaft and the standard circumferential wall.

Abstract: An indoor unit according to the present invention includes: an air-sending portion, which includes a casing having a rectangular air outlet and accommodating an impeller including a plurality of blades; a heat exchanger, which is configured to exchange heat with gas sent from the air-sending portion; and a guide portion, which includes an upper guide defining a passage for the gas and being arranged between an upper edge portion of the air outlet and an upper end portion of the heat exchanger and a lower guide defining a passage for the gas and being arranged between a lower edge portion of the air outlet and a lower end portion of the heat exchanger, and is open at side regions of the guide portion.

Abstract: A centrifugal fan includes a fan configured to be driven to rotate, and a scroll casing housing the fan. The scroll casing includes a peripheral wall having a volute shape having an inner end of a spiral thereof at a boundary with a tongue portion of the scroll casing. When a portion at the peripheral wall at which a distance between the peripheral wall and a rotation shaft of the fan is minimum is defined as a closest portion, the peripheral wall includes a narrowed portion at which the distance between the peripheral wall and the rotation shaft is reduced from the inner end toward the closest portion in a rotation direction of the fan, and an expanded portion that is formed between the narrowed portion and the closest portion and at which the distance between the peripheral wall and the rotation shaft is increased.

Abstract: A turbo fan includes a main plate rotationally driven, and a plurality of blade portions arranged at intervals in a circumferential direction on the main plate. The plurality of blade portions include a plurality of first blade portions arranged on one of plate surfaces of the main plate, and a plurality of second blade portions arranged on another plate surface of the main plate.

Abstract: A centrifugal fan includes: a fan blades; and a scroll casing housing the fan, the scroll casing including a discharge portion, and a scroll portion including a side wall, a circumferential wall, and a tongue portion. In the circumferential wall, at a first end between the circumferential wall and the tongue portion, and at a second end between the circumferential wall and the discharge portion, a distance between an axis of the rotational shaft and the circumferential wall is equal to a distance between the axis of the rotational shaft and a standard circumferential wall, and is greater than or equal to the distance between the first end and the second end of the circumferential wall, the circumferential wall including a plurality of extended portions between the first end and the second end of the circumferential wall.

Abstract: In a centrifugal air-sending device, a first area portion has a first vertex that is an intersection point of a curve line formed by a tongue portion and a bisector of a first connection straight line connecting a winding start portion and an end of a discharge portion. A second area portion has a second vertex that is an intersection point of the curve line formed by the tongue portion and a bisector of a second connection straight line connecting the winding start portion and the end of the discharge portion. When a virtual straight line connecting a rotational axis and the first vertex is defined as a first straight line, and a virtual straight line connecting the rotational axis and the second vertex is defined as a second straight line, the second straight line is longer than the first straight line.

Abstract: A centrifugal blower includes a fan including a main plate having a disk-shape, and a plurality of blades, and a scroll casing configured to accommodate the fan. The scroll casing includes a discharge portion and a scroll portion including a side wall, a circumferential wall, and a tongue portion. The circumferential wall includes a curved circumferential wall and a flat circumferential wall. In comparison with a centrifugal blower including a standard circumferential wall having a logarithmic spiral shape in cross-section perpendicular to a rotational shaft of the fan, in the curved circumferential wall, at a first end being a boundary between the circumferential wall and the tongue portion and at a second end being a boundary between the circumferential wall and the discharge portion, a distance L1 between an axis of the rotational shaft and the circumferential wall is equal to a distance L2 between the axis of the rotational shaft and the standard circumferential wall.

Abstract: A centrifugal air blower comprises a fan; and a scroll casing. The scroll casing includes: a sidewall covering the fan from an axial direction of a rotation axis on which the fan rotates, the side wall having a suction opening for sucking air; a discharge opening for discharging an airflow generated by the fan; a tongue portion for guiding the airflow to the discharge opening; a peripheral wall surrounding the fan from a radial direction of the rotation axis; and a bell mouth formed along the suction opening of the sidewall. The bell mouth includes an upstream end and a downstream end, the upstream end being an end portion on an upstream side in a direction of flow of the air passing through the suction opening, the downstream end being an end portion on a downstream side in the direction of flow of the air.

Abstract: An indoor unit according to the present invention includes: an air-sending portion, which includes a casing having a rectangular air outlet and accommodating an impeller including a plurality of blades; a heat exchanger, which is configured to exchange heat with gas sent from the air-sending portion; and a guide portion, which includes an upper guide defining a passage for the gas and being arranged between an upper edge portion of the air outlet and an upper end portion of the heat exchanger and a lower guide defining a passage for the gas and being arranged between a lower edge portion of the air outlet and a lower end portion of the heat exchanger, and is open at side regions of the guide portion.

Abstract: This game system (1) includes multiple game machines (2A, 2B) connected to a network (5), allows a player of a game machine to select one of selective items on a game prepared in advance, and allows the player to play a game having content reflecting the selected item. This game system is provided with a device (32) for storing relation data for determining whether or not a predetermined connection exists between players, a device (11) for determining the selection state pertaining to the items selected by the players on the game machines, a device (11, 12) for determining, based on the relation data, other players that have the predetermined connection with the player, and a device (21) which, when the player is making the selection from the selective items, presents the player making the selection with the selection state of other players having the predetermined connection with that player.

Abstract: A signal transmission medium for transmitting EHF band signals from a first point to a second point, including: a first end at which a signal exchange with the first point takes place; a second end at which a signal exchange with the second point takes place; and a transmission line portion which is flexible and connects the first end and the second end. The transmission line portion includes: strip conductors which are formed substantially down a center of a flexible printed circuit board to establish electrical connection between a signal line at the first end and a signal line at the second end; and a pair of grounding sheets which are arranged in parallel to each other at a substantially constant gap from the flexible printed circuit board in 180-degree opposite directions. The cavities are formed between the pair of grounding sheets and the strip conductors.

Abstract: This game system (1) includes multiple game machines (2A, 2B) connected to a network (5), allows a player of a game machine to select one of selective items on a game prepared in advance, and allows the player to play a game having content reflecting the selected item. This game system is provided with a device (32) for storing relation data for determining whether or not a predetermined connection exists between players, a device (11) for determining the selection state pertaining to the items selected by the players on the game machines, a device (11, 12) for determining, based on the relation data, other players that have the predetermined connection with the player, and a device (21) which, when the player is making the selection from the selective items, presents the player making the selection with the selection state of other players having the predetermined connection with that player.