A cross-flow fan made of resin includes first and second fan blocks joined together. The first fan block includes a first support plate, plural first blades connected to the first support plate, and a first outer peripheral ring having a first ring portion that interconnects outer ends of the plural first blades. The second fan block includes a second support plate, plural second blades having second one-side distal ends connected to the second support plate, and a second outer peripheral ring having a second ring portion that interconnects outer ends of the plural second blades adjacent second other-side distal ends of the plural second blades. The second other-side distal ends of the plural second blades are joined to the first support plate, and the first support plate and the second outer peripheral ring are disposed adjacent to each other.

A blade of a cross-flow fan including leading and trailing edge portions arranged on inner and outer peripheral sides of the cross-flow, and a base portion formed between the edge portions. The edge portions are arc shaped. The base portion has a pressure surface and a suction surface. A radius of the leading-edge portion is greater than a radius of the trailing-edge portion. A maximum thickness is at a position of maximum thickness that is closer to the leading-edge portion than to the trailing-edge portion. A first thickness is at midpoint of a blade chord. A second thickness is at a position set apart from an outer-peripheral end of the blade chord by 5% of the chord length. A value obtained by dividing the first thickness by the maximum thickness that is greater than a value obtained by dividing the second thickness by the first thickness.

An energy conversion device includes a plurality of cross flow turbines, each one including fixed curved blades arranged in squirrel cage configuration about an axis of rotation. The turbines are mounted on a floating support on the water, placed directly in the fluid flow and arranged successively one after another with their axes parallel to each other and perpendicular to the flow.

A double suction fan includes first and second rings spaced at a predetermined distance apart from and in parallel to each other, an intermediate plate disposed between the first and second rings and including a shaft hole, a plurality of first blades disposed between the first ring and the intermediate plate, a plurality of second blades disposed between the second ring and the intermediate plate, and first and second rotating hubs disposed on both side surfaces of the intermediate plate, wherein each of the first and second rotating hubs is formed of a plurality of hub plates which are disposed perpendicular to the intermediate plate around the shaft hole, and wherein the plurality of hub plates are formed to evenly distribute air introduced through the first and second rings in a longitudinal direction of the plurality of first and second blades when the intermediate plate rotates.

In one aspect, a fan assembly is provided that includes a plurality of elongated metallic fan blades, a first metallic end ring, a second metallic end ring, and a metallic hub support connected to the fan blades intermediate the first and second end rings. The fan blades include straight inlet edges radially inward from first and second radially inner edges of the first and second metallic end rings so that inlet portions of the blades extend radially inward from the first and second metallic end rings. In another aspect, a fan assembly is provided that includes a hub support having a hub strip and a hub ring. The hub strip has an elongate configuration with an attachment portion connected to the hub ring at one end of the hub strip and another attachment portion connected to the hub ring at an opposite end of the hub strip.

A centrifugal fan includes: an impeller configured to suction or discharge air; a motor configured to rotate the impeller; a housing configured to accommodate the impeller and have a suction port through which air is suctioned by rotation of the impeller and a discharge port through which air is discharged by rotation of the impeller; and a cut-off portion formed on one side of the discharge port. A flow cross-sectional area of air flowing in the housing is gradually increased from the cut-off portion to the discharge port in an air flow direction, and a distance from a lower portion of the impeller to an inner peripheral surface of the housing in a rotational axis direction of the impeller is gradually increased in at least a portion from the cut-off portion to the discharge port in the air flow direction.

A heating, ventilation, and/or air conditioning (HVAC) system includes a blower assembly having a blower housing, a motor disposed at least partially within the blower housing, and an impeller comprising a plurality of blades disposed about the impeller that is connected to the motor by a shaft. The blower assembly includes a labyrinth seal that provides a tortuous leakage airflow path between the blower housing and the impeller to substantially reduce the amount of air that escapes from the blower housing between the blower housing and the impeller to provide an increased blower efficiency as compared to traditional blower assemblies.

Disclosed are a cross-flow wind turbine and a fan heater applying the cross-flow wind turbine, in which the cross-flow wind turbine includes two fixing plates oppositely disposed and a plurality of blades connected between the two fixing plates, the plurality of blades being disposed at intervals along an outer edge of the fixing plate, and the blades are disposed twisted along an axial direction of the cross-flow wind turbine, and a relative twisting angle at both ends of one of the blades is no less than 5 and no more than 40.

A centrifugal blower assembly includes a housing and a blower wheel coupled to the housing. The blower wheel includes a plurality of blades circumferentially-spaced about an axis of rotation. Each blade includes a length and is oriented at a first angle along the length with respect to the rotational axis. The centrifugal blower assembly also includes a plurality of circumferentially-spaced fins coupled in flow communication with said blower wheel, said plurality of fins configured to direct an inlet airflow into the blower wheel such that a relative velocity direction of the inlet airflow is oriented at the first angle with respect to the rotational axis.

A blower includes a volute shaped casing having an air inlet, and an impeller including a disk-shaped backing plate, a ring-shaped rim, and a plurality of blades supported between the backing plate and the rim. The impeller is housed in the casing. Each of the blades includes a first blade segment adjacent to the backing plate, and a second blade segment provided between the first blade segment and the rim. Each of the blades has a blade outlet angle at a trailing edge of the second blade segment different from a blade outlet angle at a trailing edge of the first blade segment. At least one of a pressure surface of the second blade segment and a suction surface of the second blade segment includes a flat surface extending toward a leading edge of the second blade segment from the trailing edge of the second blade segment.