An air outlet duct structure, an air outlet panel and a patio type air conditioner indoor unit are provided. The air outlet duct structure includes a first air duct wall and a second air duct wall arranged oppositely. An air outlet passage is formed between the first air duct wall and the second air duct wall. The first air duct wall includes a plurality of concave curved surfaces connected along an airflow direction, wherein curvature radii of the plurality of concave curved surfaces decrease sequentially along the airflow direction.

A heating, ventilation, and/or air conditioning (HVAC) system includes a discharge section housing forming a chamber, a first opening formed in the discharge section housing such that the chamber is configured to receive an air flow from a blower of the HVAC system via the first opening, and a second opening formed in the discharge section housing such that the second opening is positionally offset to the first opening. The chamber is configured to discharge the air flow through the second opening. The HVAC system also includes a guide extending across the chamber and sloping toward the second opening such that the guide is configured to direct the air flow from the first opening toward the second opening.

A pipe bend, in particular for an exhaust air duct of a fume extraction hood, which has a deflection of 60° to 120°, preferably 90°, with an inflow side and an outflow side, wherein the pipe bend has at least one air guide element which is curved in deflection direction and which extends in the interior of the pipe bend, characterized in that the pipe bend has a cross-sectional widening in flow direction behind the inflow side, in particular adjacent thereto, and a cross-sectional tapering in front of the outflow side, in particular adjacent thereto, the course of the bend of the outer wall of the bend deviating from the course of a quarter circle and having a bulge lying outside the vertex of the bend, in particular downstream of the vertex in the direction of flow.

A flow control device including a first channel, a second channel, and a diaphragm positioned between the first channel and the second channel, wherein the diaphragm includes a first side and a second side that faces an opposite direction as the first side. The diaphragm is configured and arranged to alternatively operate in both: a closed condition in which flow from the first channel to the second channel is impeded, and an open condition in which flow from the first channel to the second channel occurs. The diaphragm is also configured and arranged to change from the closed condition to the open condition when a force of a positive fluid flow through the first channel towards the first side of the diaphragm exceeds a combination of a gravitational force and a force of atmospheric pressure upon the second side of the diaphragm.

A blower assembly for a heating, ventilation, and/or air conditioning (HVAC) system includes a centrifugal fan having a fan wheel. A plurality of blades are coupled to the fan wheel at an inner blade boundary and extend radially to an outer blade boundary. The blower assembly includes a first housing panel and a second housing panel disposed on opposite sides of the centrifugal fan and extending transverse to the centrifugal fan. The blower assembly includes a wall extending between the first housing panel and the second housing panel and a flange extending from the wall at a vertex. The flange extends outwardly from the wall. A first radial distance from the vertex to the outer blade boundary is between 4 percent and 20 percent of a second radial distance from a rotational axis of the centrifugal fan to the outer blade boundary.

An air-conditioning apparatus includes a housing having an air inlet and an air outlet, a fan disposed in the housing, and a bell mouth through which a fluid flowing from the air inlet to the air outlet passes in association with rotation of the fan. The bell mouth includes curved part having a curved sectional shape in a fluid flow direction and a vibration-damping element disposed on at least one of a front surface and a rear surface of the curved part. The vibration-damping element is disposed at a position corresponding to a node of vibration of the bell mouth.

In the present invention, a wind direction is not directly changed using a wind direction adjusting wing and a guide related thereto, but the wind direction is changed due to the Coanda effect and the vortex formation. A basic principle of the present invention of adjusting a wind direction by applying a Coanda effect is to design the air ventilation apparatus such that a wind direction is adjusted upward or downward by causing a Coanda effect on one curved surface of the air ventilation apparatus connected to a skin surface of a dashboard garnish and preventing the Coanda effect from being caused on an opposite surface. In addition to the Coanda effect, a structure for artificially forming a vortex is added to the air ventilation apparatus to maximize the Coanda effect.

A diaphragmatic elbow damper joining two angularly oriented channels and configured to seal the channels in the absence of fluid flow overcoming gravity and atmospheric pressure.

The purpose of the invention is to reduce power consumption of heat exchangers (otherwise known as condensers or outdoor heat pump units) used for residential or building air conditioning and/or heating. The invention is a set of thin deflector(s) that attach to the top of the unit. The deflectors redirect air that the unit discharges vertically to a horizontal or slightly higher direction. This reduces recirculation of exhaust air to the intake when structural surfaces are close to the exchanger. Less recirculation reduces power consumption and thereby electric bills and allows the cooling and/or heating system to operate closer to capacity in ambient temperature extremes. It also could extend the life of the compressor's electrical insulation by allowing it to operate at lower temperature.

An air redirect apparatus for redirecting forced air through a register access cavity. The air redirect apparatus includes a duct elbow configured to fit into a register access cavity. The duct elbow includes an entrance aperture and an exit aperture. The entrance aperture is sized to connect to a duct opening of ductwork, which routes forced air into the register access cavity. The apparatus also includes a cover plate connected to the entrance aperture and through which the entrance aperture penetrates. The cover plate is sized to cover the duct opening of the ductwork when the entrance aperture is connected to the duct opening. When the duct elbow is fit into the register access cavity, air flow from the ductwork is routed into the entrance aperture and directed out of the exit aperture of the duct elbow, while the cover plate substantially blocks air flow around the duct elbow.